I last used FTM back in 2002 and my trees have not been touched since then. 3 days ago - I called about upgrading, I was advised to download FTM 2005 and it read and updated all my trees. I then purchased FTM 2014 and loaded all my trees again. My largest tree has 1900 people.
It works perfectly.
I'm running Windows 7 64 bit.