Elements 12 Stops Working After Eight Years

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I purchased Elements 12 in 2013; I have the store receipt, box, discs, etc. Since that time, I've been using it without issue until last week when I suddenly received the message that my "trial was expired". Curious. I've tried licensing Elements again, without luck, and/or putting in the serial number. Any suggestions, please?

[John T Smith]

Is your computer exactly the same as in 2013 or have you updated your operating system?

What you are seeing MAY actually be a compatibility issue

Two ideas that MAY work to install and/or run old programs in Windows 10
-RIGHT click the program icon or EXE and select a compatibility mode in the pop up option window
-and/or select Run as Administrator to assign FULL Windows permissions
-also https://helpx.adobe.com/x-productkb/global/create-local-administrator-account-windows.html