Error: "You've used a newer version of 1Password on this device." (See Approved Answer)

Correct, but the underlying issue is most likely a database scheme change. The only way to recover from the message is to recreate a new database using the steps above. The steps above are for 1Password for Mac, the desktop application.

You could install 1Password in the browser without needing the desktop application, but you'd lose things like Touch ID. I would encourage you to follow the steps to get 1Password 8 for Mac back on its feet, so to speak.

edit: Please see the approved answer: https://1password.community/discussion/comment/683383/#Comment_683383