I installed my MasterCollection CS4 on a second PC and I got the message "The serial number you entered is not valid", but i'ts valid.
I know there is no longer technical support on CS4, anyway since I paid for a LICENSE this license must work and if the authorization is done online, this service should be granted anyway.
How can I make my license work?
Please refer to:
Error: "The serial number is not valid for this product" | Adobe Creative Suite
Invalid serial number error
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