I have a valid license key for pdfaPilot or pdfToolbox (Desktop or Server). I have requested an activation file from callas and have dragged-and-dropped the received "License.txt" file on the activation window, but when using it I receive an error that it is not valid.
On recent Windows systems permission control for users is very strict and older pdfToolbox versions sometimes have problems with that. You can follow the solution below to fix this problem.
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