SRB2-v2125-Installer.exe - Full Installer - If you are on a 32-bit system, or you run a 32-bit operating system on a 64-bit processor, then you must install this release.
SRB2-v2125-x64-Installer.exe - Full Installer - The 64-bit release may give you a performance improvement in some levels. If you experience any issues, you may try using the 32-bit installer.
dbghelp.zip - Additional file to fix an error about dbghelp.dll (Windows XP and Vista users only). Extract the appropriate file ("i386" 32-bit or "amd64" 64-bit to the game directory.