It has come to my attention that there is a huge problem with the Tsukihime v1.2 update installer: It *will* mess up your save files, and the only thing the user can do to prevent it is manually backing up the saves before upgrading. What’s worse is that, if you’re in bad luck, it might even destroy your Fate/stay night English saves…
My sincere apologies for this blunder, I will look into fixing this as soon as possible. In the mean time, please be very careful with the Tsukihime English v1.2 installer. To be on the safe side, I suggest just not using it at all.