Hi there,
today the automated update installation failed, due to a second user account been logged in. In OSX you can switch users. therefore it is possible that more than one user in logged in. I think the TotalFinder-Update fails, because it is also running within the socond account. Only fix I know is to unlock all users till only one is left. Then download the complete installer from BinaryAge and redo the complete installation manually.
Maybe you can check the usercount before initiating the installation process.
Michi