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Hi @david.schulzeMYVKG.  It looks to me like you are looking for this methods:  ApplicationAddIn.Activate &   ApplicationAddIn.Deactivate.  If you know the 'Client ID' of the ApplicationAddIn, you can get it through ThisApplication.ApplicationAddIns.ItemById().  Or if you know the DisplayName of the add in, you can loop through the ApplicationAddIns and compare the known name to each DisplayName to find it. 

Wesley Crihfield

EESignature

(Not an Autodesk Employee)