When you try to log in to a Creative Cloud application after updating the Creative Cloud desktop app, you receive an "Unknown Server Error" message.
This page offers solutions to fix this error. Try the solutions in order; stop when you're able to log in without receiving an error message.
The Creative Cloud desktop app version 18.104.22.168 and later include an update that resolves this issue for most users. In most cases, Creative Cloud downloads and installs the update automatically when you sign in. If you're unable to sign in from the Creative Cloud desktop app, then do the following:
If the OOBE folder is not visible in the specified location, change your system settings to allow hidden files and folders to be displayed.