You can switch back and forth after the mod is installed but if you do you'll have to update the mod through the launcher when you want to play it again to avoid pink textures. If you have, make sure to switch back to 1.06 before installing using the switcher. Usually, if you haven't installed the unofficial 1.09 patch you don't need to worry about this. It is highly likely that the installer will fail to create the required Options.ini file, go to %appdata%/My The Lord of the Rings, The Rise of the Witch-king Files and download this file into itīFME2 needs to be patched to 1.06.Download the Rise of the Witch-king v2.01 Patch in your language on this page.This will mount the RotWK disk to a virtual drive. Open rotwk.iso by either double clicking or right-clicking and selecting mount.Download the Battle for Middle-earth II v1.06 Patch in your language on this page.
(Note: some antivirus programs will flag the keygen. This will mount the BfME 2 disk to a virtual drive.
This means that usually, regardless of your specs, the game can have a tendency to lag. The BFME series is built on top of the SAGE engine, an old game engine from the single-core processor era.