This support article explains how to save your old version of Final Cut Pro as a hidden Zip file and how to hide/save your work in case you decide to switch back AFTER upgrading to FCP 10.1:
http://support.apple.com/kb/HT5550
iMac (27-inch, Late 2013), OS X Mavericks (10.9), 2006 Macbook Pro
Posted on Dec 20, 2013 12:38 PM