You can down load the old iTunes from here:
First you must uninstall iTunes 11, then install the old version.
You will also need to recover your old library file.
Use the procedure in this article about something else:
I would suggest copying the backup library file rather than moving it so that you still keep the backup.
The backup will obviously reflect your library at the time of updating.
To roll back to iTunes 10.7 first download a copy of the installer from here, uninstall iTunes and suppporting software, i.e. Apple Application Support & Apple Mobile Device Support. Reboot. Restore the pre-upgrade version of your library database as per the diagram below, then install iTunes 10.7.
See iTunes Folder Watch for a tool to scan the media folder and catch up with any changes made since the backup file was created.