Outlook addin update error => addin gone and update not working!!

[Maurice]

I have been developing an outlook addin which has been upgraded multiple
times succesfully. Currenlty we have one deployment on a Pc where the upgrade
fails with the following message:
=======
The customization cannot be installed because another version is currently
installed and cannot be upgraded from this location. To install this version
of the customization, first use Add or Remove Programs to uninstall this
program: ==============

The tricky thing is that looking into the Add or Remove Programs does not
show the application/addin and even running the manual VSTO uninstall says
that the application is not installed. Still we get ths error.

Any ideas on how this issues can be solved (as this addin can not be used on
this PC now)??

Thx in advance

Maurice

 

[Ken Slovak - [MVP - Outlook]]

That usually means that the same addin class is registered already with the
same product id and upgrade id. If the addin isn't showing up in Add/Remove
you might just have to search the registry for your class name or names and
see what turns up. Searching on the CLSID might also be necessary. See if
that helps.