You might face activation failure. Try these steps:
If you are an original owner of Photoshop CS, there are two primary ways to retrieve your legitimate serial number: PS 2020 where to find product key - Adobe Community adobe photoshop cs 8.0 serial number
HKEY_LOCAL_MACHINE\Software\Adobe\Photoshop\8.0\Registration System Info: In some older versions, you can go to Help > System Info within the app to see a partial serial number. Current Support and Activation Status You might face activation failure
Which would you like?