For some reason, when the 2012 version was released, they decided to split the game's three story branches into three separate discs.

This version contains many, many new animations allowed by (I think?) the new engine, the Realta Nua hentai-replacement scenes, the voices that were sadly lacking from anyone who didn't have Mirrormoon or bought a copy of Realta Nua, and several edits to some scenes(Mostly minor edits to either A:Make it sound better in Japanese or B: Fix any plot inconsistencies caused by the prequel Fate/Zero). He's laboriously copying the translations from the 2004 version.). In 2012, a new, updated PC version came out(And this is the one that WakuWaku is working on. Specifically she is tritagonist of the Fate route, the main heroine and deuteragonist of the Unlimited Blade Works route and one of the two tritagonists of the Heavens Feel route (alongside Illyasviel von Einzbern). A fan-subbing group called Mirrormoon created a patch that extracted the voices from Realta Nua and added them to the PC version, if you owned both. Rin Tohsaka is the deuteragonist and one of the three main heroines of the visual novel and anime series Fate/stay night.

The PS2 port was significantly different (It removed and replaced the Hentai scenes with more family-friendly fare, and also added voices to the entire game). I believe there was the original PC game in 2004, then there was a PS2-only port called Realta Nua in 2007.

Fate stay night visual novel cg