We created a .Net toolbar extension in 10.2 that worked in ArcGIS 10.2. We upgraded the desktop to ArcGIS 10.4. and now when we try to uninstall the tool built in 10.2 the un-installation stops with the message below:
Error 1001.InstallUtilLib.dll .. The system can not find the path specified
How can we uninstall this toolbar extension.