I suspect if you uninstall the trial version you won't be able to run it as a trial version when you reinstall.
If you have downloaded it but you can't open it try resetting the Photoshop preferences.
Hold down Ctrl + Alt + Shift (Windows) or Cmd + Ctrl + Opt + Shift (Mac), and relaunch Photoshop. Respond in the affirmative to the dialog asking if you really want to replace the preferences.
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Quite often this error is related to permissions. You don't state your OS but Windows 10 is particularly fussy about installing with 'Admin' rights due to the pesky UAC feature. The webpage below may help
Having a subscription at this time will not solve the problem .
Terri thank you so much. I followed the link you sent and used the cleanup tool and I am working now!! You are amazing
nice to hear it worked.
I second that!