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Problems reactivating Installshield 2015

I have a problem while attempting to re-activate our installation of Installshield 2015, it started asking us for a reactivation today:

On-Line activation returns: "Error 0 - Activation of serial number failed: The quantity specified exceeds maximum quantity allowed [0]"

On-Line deactivation (tsconfig.exe /return) returns: "Error 51404 - Failed to connect to the activation server. Check your internet connection and try again"

We cant currently deactivate our installation to activate it again on the same machine. How could we proceed?


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Problems reactivating Installshield 2015