INSTALATION
1) Go to your re4 instalation folder and rename xfile.dat and xscr.dat to xfile.gca and xscr.gca.
2) Download gca.exe or get it from the zip of the patch.
3) Extract xfile and xscr using the application above
4) Now that you have two folders named xfile and xscr delete or backup xfile.gca and xscr.gca.
5) Download and extract the patch if you haven't done it allready and then extract the 7 zips inside it. There are 6 folders and the gca application now. Open each folder and copy/ paste it's content into xfile or xscr folder so as to replace the default ones.