I have never worked with a subscription, and when I launched the application, it wrote that the trial period is over. What's that supposed to mean? I've never used it and it doesn't work now
there's nothing easy (eg, you can reformat your hd, reinstall your os and then start a trial) that you can do to correct that on the problematic computer.
you can start a trial on another computer. here's more info (that may or may not be helpful), https://helpx.adobe.com/x-productkb/global/trial-software-expired-early.html
Thanks for contacting us. There seems to be some mistake here. We checked your account details and found that there is no trial or active subscription associated with this email.
Did you opt for a trial?
Let us know.