diff --git a/install.sh b/install.sh
index e0c8eae..2360295 100755
--- a/install.sh
+++ b/install.sh
@@ -17,7 +17,7 @@ SITE=https://dsa-ou.github.io/m269-installer
 DOC="See $SITE for details."
 CSS=custom.css
 REQS=requirements.txt
-CHECK="allowed.py m269.json"
+CHECK="allowed.py m269.json uninstall.sh"
 FILES="$CSS $REQS $CHECK"
 COURSE=m269-23j
 VENV=~/venvs/$COURSE
@@ -87,7 +87,8 @@ then
     echo "Downloading and installing M269 files..."
     for file in $FILES
         do
-            curl -LO https://github.com/dsa-ou/m269-installer/raw/main/$file
+            # WARNING: CHANGE URL BACK TO MAIN BRANCH BEFORE MERGING!!!
+            curl -LO https://github.com/dsa-ou/m269-installer/raw/14-create-uninstallation-scripts/$file
         done
     mkdir -p ~/.jupyter/custom
     # don't overwrite existing CSS file
diff --git a/uninstall.sh b/uninstall.sh
index 863f90c..048cbb1 100755
--- a/uninstall.sh
+++ b/uninstall.sh
@@ -9,7 +9,7 @@
 # - Optionally clears M269 styling from Jupyter's custom.css.
 
 # Note: this script expects FOLDER and SHELL_CONFIG_FILE to be set during the
-# installation process (inserted with sed in install.sh).
+# installation process (inserted with sed via install.sh).
 
 COURSE=m269-23j
 VENV=~/venvs/$COURSE
@@ -17,7 +17,7 @@ CSS_FILE=~/.jupyter/custom/custom.css
 COURSE_YEAR=23
 SITE=https://dsa-ou.github.io/m269-installer
 
-# Check FOLDER and SHELL_CONFIG_FILE have been set
+# Check FOLDER and SHELL_CONFIG_FILE have been set i.e inserted via install.sh
 if [[ -z "$FOLDER" ]] || [[ -z "$SHELL_CONFIG_FILE" ]]; then
     echo "Error: critical variables have not been set"
     exit 1
@@ -43,12 +43,13 @@ confirm() {
 echo "Warning: This script will make the following changes: "
 echo " - Remove the virtual environment in $VENV."
 echo " - Remove the aliases 'nb', 'allowed' and '$COURSE' from $SHELL_CONFIG_FILE"
+echo " - Optionally removes M269 custom styling from $CSS_FILE"
 echo "As a result, Jupyter notebooks will no longer be readable or executable unless another Jupyter environment exists."
 if ! confirm "Proceed with uninstallation?"; then
     exit 0
 fi
 
-# Verify and remove the virtual environment folder.
+# Verify and remove the virtual environment.
 remove_venv() {
     test -n "$VENV" || return 1
     test -d "$VENV" || return 1
@@ -63,7 +64,7 @@ remove_venv || { echo "Error: failed to remove the virtual environment."; exit 1
 # Remove allowed.py and m269.json from M269 folder
 for file in "allowed.py" "m269.json"; do
     target="$FOLDER/$file"
-    if [ -f "$target" ]; then
+    if [[ -f "$target" ]]; then
         echo "Removing $file from $FOLDER..."
         rm "$target"
     else
@@ -73,7 +74,7 @@ done
 
 # Remove aliases from the configuration file
 ALIASES=("alias nb" "alias allowed" "alias $COURSE")
-if [ -f $SHELL_CONFIG_FILE ]; then
+if [[ -f "$SHELL_CONFIG_FILE" ]]; then
     echo "Removing shortcut commands from $SHELL_CONFIG_FILE..."
     cp "$SHELL_CONFIG_FILE" "$SHELL_CONFIG_FILE".backup
     for alias in "${ALIASES[@]}"; do
@@ -89,7 +90,7 @@ if confirm "Remove M269 custom styling from $CSS_FILE ?"; then
     # Special characters need to be escaped for use in regex
     START_DELIM="\/\* Start of [Mm]269-$COURSE_YEAR[Jj] notebook styling. \*\/"
     END_DELIM="\/\* End of [Mm]269-$COURSE_YEAR[Jj] notebook styling. \*\/"
-    if [ -f $CSS_FILE ]; then
+    if [[ -f "$CSS_FILE" ]]; then
         cp "$CSS_FILE" "$CSS_FILE".backup
         echo "Removing M269 custom styling from $CSS_FILE..."
         sed -i "/$START_DELIM/,/$END_DELIM/d" "$CSS_FILE"