I am a huge fan of 1Password and the update process has always gone very smoothly, however recently while attempting to upgrade from 4.4.2 to version 4.4.3 I kept getting an error message about how the application archive failed to extract.
I tried absolutely everything and came to the conclusion that this is an issue with the update package or the update software itself.
The fix is to manually download the update from the 1Password site here and manually install it (which works). Annoying, but not world ending.