Sorry about the inconvenience caused by this issue. In addition to @marliton@Mylenium suggestion, please try Sign out and sign in back to the Creative Cloud Desktop app. If that doesn't work then follow the instructions given in this help article.
Error 205 generally occurs when the app is unable to store your profile and licensing information in the secure storage (keychain in macOS and Credential manager in Windows) on your computer.
Kindly update the discussion if you still need assistance with it. We'd be happy to help.