When trying to activate InstallShield or AdminStudio, the following error message is displayed:
Serial Number Not Registered
Error 20661 – The serial number you purchased requires product registration prior to serial number activation.
Clicking the ‘Register my product online’ button will redirect you to the Product Registration page on the Flexera Software web site. If you attempt to register the serial number on this web site, the following message is displayed:
“<SERIAL NUMBER>: This serial number has already been registered.”