FTM 2014 is the first version of FTM to fully support 64 bit computers. It will be able to read your Version 11 file and convert it to FTM 2014 format.
You should compress your FTM 11 file and run file checker before converting. Fixing any errors before converting may prevent problems with the conversion. Also have a backup of your FTM 11 file in a safe place before converting. It never hurts to protect yourself.
You will have a learning curve. Starting with FTM 2008 the user interface to FTM changed.