There were quite a few versions of SF2 between 1993-1995. There was one called SF IBM, which was the version I played. There were also rumors of a "Champion Edition" in 1993, which I never saw, simply because the HDD space required was 20MB. My PC had an incredibly low 40MB size back then haha.
And there was another one called SF Liu, which more or less had all the characters EXCEPT Vega, which had been replaced with Andy Bogard for some reason. SF Liu was a "port" of Hyper Fighting, where some stuff like Guile's Roundhouse flash kick hitting twice, and Dhalsim had his teleport. Even the character portraits used the colors for Hyper Fighting.
There was an OFFICIAL version of SF2 The World Warrior for PC, and it SUCKED. Capcom gave the license to US Gold, who really did a half-assed job. The classic SF2 music was replaced with a terrifying new soundtrack, which simply looped all the time. Instead of 6 buttons, there was only 1 punch button and 1 kick button. You had to hit punch + a direction to trigger stronger attacks. For example, hit the Punch button to get Jab, hit Punch + Back to get Strong, and hit Punch + Up to get Fierce. And all special moves used the Strong version only. Now, I could forgive the game if this was the only problem, but even the gameplay sucked! It only looked like SF2, but plays nothing like it. Characters soared in the air when jumping, the "physics" of SF2 was gone, and the combo system didn't work.
But when it was time to port Super Street Fighter II Turbo, all the previous issues with SF2 The World Warrior was forgiven. Ported by Gametek in 1995, this was the version you played. Did you know there were only 2 versions of SSF2T released initially? One for the 3DO, and one for PC-DOS. Wait, didn't SSF2T REQUIRE a 486DX2/66 to run? I was chugging along with my 363SX/33, and mine was even worse. I could see every single frame of animation lol. At that time I didn't even know the game had super moves, until I accidentally did Ryu's Shinkuu Hadouken while trying to execute a Shoryuken. See, because SF2 had strict input timing, and because my stupid PC was damn slow, I can't execute special moves in a smooth motion, otherwise it will not register. Instead of doing Down, Down-Forward,Forward + Punch, mine was Down, half second pause, Down-Forward, half-second pause, Forward, half-second pause, Punch. So, while trying to do a Shoryuken (Forward,Down,Down-Forward+Punch), I must have entered the Hadouken motion twice instead. From then on, I started looking into the other character's Super moves.

I think 486DX4 was the minimum for SSF2T but I didn't mess around with it once I upgraded to Pentium 133 around the end of 1995 / 1996 ? as I dont have the 5 1/4 floppy drive. Can't remember where I got SSF2T in 5 1/4 as I didn't recall buying it or copying it from shops. Started buying PC games via 3 1/2 floppy at the ground floor Imbi plaza or was it SG wang - memory abit fuzzy now, the small shop was in a corner.