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Out of those I've only dealt with ThinkCell and I have a rule that works - are you hiding HKLM\Software\Microsoft\Office\Excel\Addins\thinkcell.addin plus all the other usual stuff?

Sounds like com add ins haven’t been captured with those launch errors

okay - seems I've missed the key's below ..\microsoft\office\excel\addins\... first tests looking promising - no errors with my test user so far. Thanks a lot Daniel!