I would try this:
Delete the folder for 12.04 called “Tor Browser” or better yet just rename the folder to “Tor Browser 12.04” then install a freshly downloaded Tor installation file from the Tor web site.
Then if the 12.5.1 does not work just delete the “Tor Browser” folder and rename the “Tor Browser 12.04” folder to “Tor Browser”. There might be leftover residue when you update/upgrade.
Of course you know that the double quotes are not part of the folder names.