This unlicenzed Adobe app

start here, https://helpx.adobe.com/manage-account/kb/stop-creative-cloud-trial-mode-after-purchase.html

ONLY IF YOUR ACCOUNT SHOWS A SUBSCRIPTION WITH NO PAYMENT PROBLEMS, proceed to these steps -

https://helpx.adobe.com/enterprise/kb/resolve-trial-and-license-expired-errors.html

and if that fails, https://helpx.adobe.com/download-install/kb/adobe-license-issues-keychain-credential-mgr.html

additionally, below are solutions some users reported:

if those all fail, change your cc language. eg, try international english

if that fails, change the install location