Final Fantasy 6 was released as part of the Final Fantasy Anthology for the PSX in 1999 and as most abandonware sites consider PSX games/roms warez, the game has been removed from the download list of all abandonware sites I know.
Sorry, but I googled and the only place I found that had it was a definite warez site that I will not put the link to on this forum. Perhaps you just need to google yourself and see if you can find it the same way, or check e-bay etc and buy an orginal copy.
If anyone is interested, I did find this
freeware game that was inspired by Final Fantasy. It may be worth a look
.