I have an add-in 10 Studio in AppSource.
The current version (on 08/22/2019) is 1.5.1.0. We load well this version in Excel for Windows:
However, when we load the same add-in from the add-in Store in Excel for Mac, it returns the version 1.3.0.0.
It seems that the old version in Excel for Mac cannot be overridden. I followed this method, cleared web cache by using the personality menu from the task pane, and remove everything in ~/Library/Containers/com.microsoft.Excel/Data/Library/Caches/. But the old version was still there and could not be overridden by the new version from the Store.
Does anyone know what's happening here?
Did you try first removing the old version?
How to uninstall an Add-in (Mac)
If you wish to uninstall an Add-in completely, delete, move or rename the original Add-in file.
When ticking or unticking the Add-in, a message box will appear, asking for permission to delete the reference to the Add-in. Click Yes.
The Add-in will no longer appear in the list of Add-ins.
(Source)