Julie I had FTM12, then upgraded to FTM14 as ancestry no longer support FTM, it is another company now.
Once I installed FTM14 and went to open the my files FTM did the conversion for me. The same happened when I upgraded to FTM17, which is the latest version and what you would want. You ca not use the file on the old program once it has been converted.
The only thing all the literature said was to make sure you back up the original files just in case something goes wrong and then you still have your original program and files. Mackiev are very good at responding and helping if need be.
Just a warning all the installing and upgrading can take time so don't panic if it say 30 minutes to upload. It didn't actually take that amount of time when I did it.
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Toni 
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