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

@henryturkel

If you're no longer seeing the "newer version" message when opening 1Password, I would suggest making sure that all of the items in 1Password on your Mac are also visible on 1Password.com.

Click the ↓≡ sorting options at the top of the All Items list in 1Password for Mac to see the item count, and compare that to the item count in All Vaults on 1Password.com. If there's a difference, please send us a diagnostics report following Dave's instructions.

Otherwise, if everything is as expected, you don't need to take any further action. We'll be here if you need help at any time.