Right now, 1Password knows it's out-of-date, but clicking "Update" fails. I can see the installer popping up for a very brief moment, but it disappears instantly, doesn't upgrade, and 1Password does not relaunch. When I launch it again manually, it again tells me it's out-of-date.
I have a link to manually download at least 6.3.360, so I can probably unwedge myself, but I wanted to hold here in case I can provide you any additional information or diagnostics.
1Password Version: 6.3.352
Extension Version: Not Provided
OS Version: Windows 10
Sync Type: 1Pass Account