diff --git a/13-looking-up-data.html b/13-looking-up-data.html
index cee0ce02..4ad35736 100644
--- a/13-looking-up-data.html
+++ b/13-looking-up-data.html
@@ -331,7 +331,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Looking Up Data</h1>
-        <p>Last updated on 2023-11-22 |
+        <p>Last updated on 2024-05-08 |
         
         <a href="https://github.com/librarycarpentry/lc-open-refine/edit/main/episodes/13-looking-up-data.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
         
@@ -651,7 +651,7 @@ <h3 class="callout-title">Extensions<a class="anchor" aria-label="anchor" href="
 can be downloaded and installed to add functionality to your OpenRefine
 installation.</p>
 <p>A list of Extensions (not necessarily complete) is given on the
-OpenRefine downloads page at <a href="https://openrefine.org/download.html" class="external-link">http://openrefine.org/download.html</a>.</p>
+OpenRefine Extensions page at <a href="https://openrefine.org/extensions" class="external-link">http://openrefine.org/extensions</a>.</p>
 </div>
 </div>
 </div>
@@ -729,7 +729,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "url": "https://librarycarpentry.github.io/lc-open-refine/13-looking-up-data.html",
   "identifier": "https://librarycarpentry.github.io/lc-open-refine/13-looking-up-data.html",
   "dateCreated": "2018-04-12",
-  "dateModified": "2023-11-22",
+  "dateModified": "2024-05-08",
   "datePublished": "2024-05-08"
 }
 
diff --git a/aio.html b/aio.html
index d664fb15..f78c800f 100644
--- a/aio.html
+++ b/aio.html
@@ -2538,7 +2538,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
 </div>
 </section></section><section id="aio-13-looking-up-data"><p>Content from <a href="13-looking-up-data.html">Looking Up Data</a></p>
 <hr>
-<p>Last updated on 2023-11-22 |
+<p>Last updated on 2024-05-08 |
         
         <a href="https://github.com/librarycarpentry/lc-open-refine/edit/main/episodes/13-looking-up-data.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -2893,7 +2893,7 @@ <h3 class="callout-title">Extensions<a class="anchor" aria-label="anchor" href="
 can be downloaded and installed to add functionality to your OpenRefine
 installation.</p>
 <p>A list of Extensions (not necessarily complete) is given on the
-OpenRefine downloads page at <a href="https://openrefine.org/download.html" class="external-link">http://openrefine.org/download.html</a>.</p>
+OpenRefine Extensions page at <a href="https://openrefine.org/extensions" class="external-link">http://openrefine.org/extensions</a>.</p>
 </div>
 </div>
 </div>
diff --git a/instructor/02-importing-data.html b/instructor/02-importing-data.html
index 3b1fdf42..0f870168 100644
--- a/instructor/02-importing-data.html
+++ b/instructor/02-importing-data.html
@@ -452,7 +452,7 @@ <h3 class="callout-title">Create your first OpenRefine project (using
   <h3 class="accordion-header" id="headingInstructor1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Instructor Note</h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <p>This is a good moment to review the points from <a href="01-introduction.html#what-should-i-know-when-working-with-openrefine">What
 Should I Know When Working with OpenRefine?</a></p>
@@ -485,7 +485,7 @@ <h3 id="going-further">Going Further<a class="anchor" aria-label="anchor" href="
   <h3 class="accordion-header" id="headingInstructor2">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Instructor Note</h3>
 </button>
-<div id="collapseInstructor2" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor2" aria-labelledby="headingInstructor2">
+<div id="collapseInstructor2" class="accordion-collapse collapse" aria-labelledby="headingInstructor2" data-bs-parent="#accordionInstructor2">
 <div class="accordion-body">
 <p>Carefully guide learners on how to revisit OpenRefine’s homepage to
 explore import options when creating new or re-opening existing
diff --git a/instructor/11-using-arrays-transformations.html b/instructor/11-using-arrays-transformations.html
index 80200da4..29b63455 100644
--- a/instructor/11-using-arrays-transformations.html
+++ b/instructor/11-using-arrays-transformations.html
@@ -376,7 +376,7 @@ <h3 class="card-title">Objectives</h3>
   <h3 class="accordion-header" id="headingInstructor1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Different meanings of ‘transformation’</h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <p>Ask the students what transformation means to them currently. Many
 may only know it from Excel to convert columns into rows or vice versa.
@@ -480,7 +480,7 @@ <h3 class="accordion-header" id="headingInstructor1">
   <h3 class="accordion-header" id="headingInstructor2">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Recap on best practice for separators</h3>
 </button>
-<div id="collapseInstructor2" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor2" aria-labelledby="headingInstructor2">
+<div id="collapseInstructor2" class="accordion-collapse collapse" aria-labelledby="headingInstructor2" data-bs-parent="#accordionInstructor2">
 <div class="accordion-body">
 <p>Recall previous discussion of dangers of changing separators and
 ensuring you avoid using a separator character that is already used in
diff --git a/instructor/13-looking-up-data.html b/instructor/13-looking-up-data.html
index 8aa12b5e..d1a7b87e 100644
--- a/instructor/13-looking-up-data.html
+++ b/instructor/13-looking-up-data.html
@@ -331,7 +331,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Looking Up Data</h1>
-        <p>Last updated on 2023-11-22 |
+        <p>Last updated on 2024-05-08 |
         
         <a href="https://github.com/librarycarpentry/lc-open-refine/edit/main/episodes/13-looking-up-data.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
         
@@ -653,7 +653,7 @@ <h3 class="callout-title">Extensions<a class="anchor" aria-label="anchor" href="
 can be downloaded and installed to add functionality to your OpenRefine
 installation.</p>
 <p>A list of Extensions (not necessarily complete) is given on the
-OpenRefine downloads page at <a href="https://openrefine.org/download.html" class="external-link">http://openrefine.org/download.html</a>.</p>
+OpenRefine Extensions page at <a href="https://openrefine.org/extensions" class="external-link">http://openrefine.org/extensions</a>.</p>
 </div>
 </div>
 </div>
@@ -731,7 +731,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "url": "https://librarycarpentry.github.io/lc-open-refine/instructor/13-looking-up-data.html",
   "identifier": "https://librarycarpentry.github.io/lc-open-refine/instructor/13-looking-up-data.html",
   "dateCreated": "2018-04-12",
-  "dateModified": "2023-11-22",
+  "dateModified": "2024-05-08",
   "datePublished": "2024-05-08"
 }
 
diff --git a/instructor/aio.html b/instructor/aio.html
index cabdc4ce..b74a76d6 100644
--- a/instructor/aio.html
+++ b/instructor/aio.html
@@ -795,7 +795,7 @@ <h3 class="callout-title">Create your first OpenRefine project (using
   <h3 class="accordion-header" id="headingInstructor1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Instructor Note</h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <p>This is a good moment to review the points from <a href="01-introduction.html#what-should-i-know-when-working-with-openrefine">What
 Should I Know When Working with OpenRefine?</a></p>
@@ -833,7 +833,7 @@ <h3 id="going-further">Going Further<a class="anchor" aria-label="anchor" href="
   <h3 class="accordion-header" id="headingInstructor2">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Instructor Note</h3>
 </button>
-<div id="collapseInstructor2" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor2" aria-labelledby="headingInstructor2">
+<div id="collapseInstructor2" class="accordion-collapse collapse" aria-labelledby="headingInstructor2" data-bs-parent="#accordionInstructor2">
 <div class="accordion-body">
 <p>Carefully guide learners on how to revisit OpenRefine’s homepage to
 explore import options when creating new or re-opening existing
@@ -2352,7 +2352,7 @@ <h3 class="card-title">Objectives</h3>
   <h3 class="accordion-header" id="headingInstructor1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Different meanings of ‘transformation’</h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <p>Ask the students what transformation means to them currently. Many
 may only know it from Excel to convert columns into rows or vice versa.
@@ -2461,7 +2461,7 @@ <h3 class="accordion-header" id="headingInstructor1">
   <h3 class="accordion-header" id="headingInstructor2">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Recap on best practice for separators</h3>
 </button>
-<div id="collapseInstructor2" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor2" aria-labelledby="headingInstructor2">
+<div id="collapseInstructor2" class="accordion-collapse collapse" aria-labelledby="headingInstructor2" data-bs-parent="#accordionInstructor2">
 <div class="accordion-body">
 <p>Recall previous discussion of dangers of changing separators and
 ensuring you avoid using a separator character that is already used in
@@ -2630,7 +2630,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
 </div>
 </section></section><section id="aio-13-looking-up-data"><p>Content from <a href="13-looking-up-data.html">Looking Up Data</a></p>
 <hr>
-<p>Last updated on 2023-11-22 |
+<p>Last updated on 2024-05-08 |
         
         <a href="https://github.com/librarycarpentry/lc-open-refine/edit/main/episodes/13-looking-up-data.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <p>Estimated time: <i aria-hidden="true" data-feather="clock"></i> 30 minutes</p>
@@ -2986,7 +2986,7 @@ <h3 class="callout-title">Extensions<a class="anchor" aria-label="anchor" href="
 can be downloaded and installed to add functionality to your OpenRefine
 installation.</p>
 <p>A list of Extensions (not necessarily complete) is given on the
-OpenRefine downloads page at <a href="https://openrefine.org/download.html" class="external-link">http://openrefine.org/download.html</a>.</p>
+OpenRefine Extensions page at <a href="https://openrefine.org/extensions" class="external-link">http://openrefine.org/extensions</a>.</p>
 </div>
 </div>
 </div>
diff --git a/md5sum.txt b/md5sum.txt
index 268064df..584baf74 100644
--- a/md5sum.txt
+++ b/md5sum.txt
@@ -15,7 +15,7 @@
 "episodes/10-data-transformation.md" "47399b9f87a7c2dfae1d6b67eea71cc7" "site/built/10-data-transformation.md" "2023-05-26"
 "episodes/11-using-arrays-transformations.md" "e115138dcb3c916bcaf5634600e594c4" "site/built/11-using-arrays-transformations.md" "2024-01-09"
 "episodes/12-export-transformation.md" "aa6dd576a893a0870baa24611573e50b" "site/built/12-export-transformation.md" "2023-05-01"
-"episodes/13-looking-up-data.md" "4be5191800691af09ff34b5fdd4c05bd" "site/built/13-looking-up-data.md" "2023-11-22"
+"episodes/13-looking-up-data.md" "4836a684fdebc498516367130e729746" "site/built/13-looking-up-data.md" "2024-05-08"
 "instructors/instructor-notes.md" "c2dfd88f1e85cccb9cbe872530c534ac" "site/built/instructor-notes.md" "2023-11-21"
 "learners/discuss.md" "60c724559d15d89fc50c5418d87f9628" "site/built/discuss.md" "2023-10-20"
 "learners/reference.md" "be4b8a891809c85a625fff879855921a" "site/built/reference.md" "2023-05-01"
diff --git a/pkgdown.yml b/pkgdown.yml
index f345f742..b57d9b8e 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 3.1.11
 pkgdown: 2.0.9
 pkgdown_sha: ~
 articles: {}
-last_built: 2024-05-08T17:29Z
+last_built: 2024-05-08T17:34Z