added update template guide

added troubleshooting guide to update Blender 3.6 created templates to Blender 4+

docs/ue2rigify/trouble-shooting/faq.md

@@ -12,6 +12,52 @@ Rigify generates a new rigify rig, those could get stomped on. Thus, renaming th
 rig is necessary for this to work.
 
 ## Where are Rig templates stored?
-Rig templates are stored within:
+Default location for Rig templates if a custom location hasn't been set:
 - windows: `%TEMP%\ue2rigify\resources\rig_templates`
-- unix: `/tmp/ue2rigify/resources/rig_templates`
+- unix: `/tmp/ue2rigify/resources/rig_templates`
+
+## How do I update a metarig made in Blender 3.6 for use in 4.0+?
+Since Blender 4.0 removed Bone Layers, Rigify had to change the generated template which causes an error when importing your  UE2Rigify template.
+
+However there is a solution built into Rigify that can update the metarig when you load a 3.6 Blend file in Blender 4+. Here's how you can update your template:
+
+>Requires Blender 3.6
+
+1. Open your exported template zip file and extract the metarig.py file to the following location in your Blender 3.6 install:
+
+`C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\rigify\metarigs`
+
+![1](./images/1.png)
+
+2. Rename metarig.py to something recognizable i.e.
+`demometarig.py`
+
+3. Open Blender 3.6 and add your metarig to the scene
+
+![2](./images/2.png)
+
+4. Create a new save, close Blender 3.6, and open the new save in Blender 4+
+
+5. Select the rig and open the Armature data tab. You should see Rigify tell you it needs to update to Collections. Click `Upgrade Metarig`
+
+![3](./images/3.png)
+
+6. Switch to Edit Mode with the armature still selected. A Rigify menu should appear at the top. Click `Rigify > Encode Metarig`
+
+![4](./images/4.png)
+
+7. Switch your Viewport to Text Editor and open the new metarig.py
+
+![5](./images/5.png)
+
+![6](./images/6.png)
+
+8. Save the file to Desktop keeping the name as `metarig.py` and replace the metarig file in your template zip with the new one.
+
+![7](./images/7.png)
+
+9. Before attempting to import your template again, **you must delete the previous attempt from UE2Rigify's templates folder.** Default location can be found above.
+
+10. Restart Blender 4+ and import your template. It should now work as intended!
+
+![8](./images/8.png)