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Works okay on one but not the other. Uninstalled and reinstalled--still gives same unitelligible error message. Latest version of Lightroom Classic works okay on both.
What version number of Windows 10 on each?
Photoshop 2021 (photoshop version 22) now requires your computer processor have SSE 4.2.
Have a look at this thread and see if error message matches.
As suggested, I uninstalled Ps 2021 on my older laptop and reinstalled Ps 2020--and it works fine. Thanks for your helpful responses to my post. JLB