Sorry if I sounded harsh on my previous reply but I said sevral times already what to download. I deleted the post to make a fully detailed answere. So here is what you need to know if you want to play to Fate Stay Night:
NB:
for those who get blue windows when trying to start Fate Stay Night Realta Nua (with error message) update your C++ redistributables from Microsoft site. If it still dont work try
this first (any feedback would be appreciated as it don't work for me) and if the problem is still here you will have to delet datasc.ksd and datasu.ksd from \Documents\faterealtanua_savedata folder each time before playing.
Pro tip, you can do it with a batch file:
- Create a shortcut for the game exe you want, depending of the route (here it is the first one), in \Documents\faterealtanua_savedata
- Copy the following code into a text editor and save as .bat in faterealtanua_savedata folder
del datasc.ksd
del datasu.ksd
FateSaber.lnk
- OPTIONAL, create a shortcut to the .bat anywhere you want
- Start from shortcut or direcly from the .bat file
- This will reset options, screen size, volume, ...
- Don't know if this happen with Ultimate Edition
Changelog:
16th May 2025, better reading.
5th June 2025, link to Weeb King
solution for blue windows.
13th September 2025, updated infos and corrected few typos.
09th November 2025, corrected more typos

, updated and rephrased some parts based on JorgeÚnico
comment.