I have been having a similar issue, running 10.6.1 and have not been able to use the add-in due to the "No GUI components found in this Add-In. Add-In version does not match" message. I have uninstalled and reinstalled Desktop and still no luck. The add-in works on other machines that already have the add-in installed (regardless of version) , however new users trying to install it get an error. Any others have any luck?
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