Why won't my installed Adobe CS5 design premium work anymore

[L2354684]

My program is an upgraded version, but was working fine in November/December 2021, when I used it last. Now it won't let me open any of my files or let me access my programs 

[Nancy OShea]

Which operating system and version do you have?

I'm guessing a recent OS update may have caused legacy CS5 to stop working because it's 12 years old and no longer updated.

If your OS still supports CS5, you could try reinstalling it from your original installation disks/downloads that you received at purchase.  You'll need the serial numbers from CS5 and your qualifying product version which can usually be found in your Adobe account.

https://account.adobe.com/products