If you are trying to install the game from these files, consider the following based on GOG support and community forums:
: If the game crashes on launch, especially for Darksiders II , try deleting the options.dopt configuration file in AppData\Local\Darksiders2 to reset your settings.
: Use a utility like WinRAR or 7-Zip . Right-click on part1.rar and select "Extract Here"; the software will automatically pull data from part2.rar and any subsequent parts to rebuild the full installer.
: Once extracted, look for an .exe file (typically named setup_darksiders_...exe ) to begin the installation.
