Changes are not made to updated versions of an add-in installed in ArcMap

Description

When changes are made to an add-in, and the new version of the add-in is installed in ArcMap, the new version is displayed in the Add-In Manager. However, the changes might not get updated in the dynamic link libraries (DLLs) located in the AssemblyCache folder, and the previous version of the add-in might remain.

Cause

Add-ins automatically unpack the install folder's contents to a temporary folder called AssemblyCache. This issue occurs because the AssemblyCache folder does not recognize the updated version of the add-in, and the previous version of the add-in remains cached in the AssemblyCache folder, located at:
 

C:\Users\xxxxxx\AppData\Local\ESRI\Desktop10.x\AssemblyCache

Note:
The AppData folder is hidden and the AssemblyCache folder is hidden and protected by default in Windows Explorer.

Solution or Workaround

1. Delete the older version of the add-in using the Add-In Manager.
   1. In ArcMap, go to Customize > Add-In Manager.
   2. Select the add-in.
   3. Click the Delete this Add-In button.

Note:
The add-in can also be deleted directly from the add-in folder, located at:
C:\Users\xxxxxx\Documents\ArcGIS\AddIns\Desktop10.x\

2. Close the current ArcMap session, and start a new ArcMap session.
3. Close the ArcMap session again. When this step completes, the previous version of the add-in is deleted from the AssemblyCache folder, and the updated add-in is reflected in ArcMap.