I know this answer may be late, but the Creator of Freedom Fighters 2 "MugenHunter" just released Freedom Fighters 2 Plus, which is an upgrade of the original, not too long ago. Here is a link to it.
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Downloads for sonic, tails and most sonic characters for mugen http://mugencharacters.ucoz.com/load/25
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get the download file
sonicthefighters.zip
Sonic the fighters is not downloadable, most people say it's illegal, and for those of you saying that there is a sonic the fighters 2 and it's downloadable, then you are wrong. There is no sonic the fighters 2.