Please download it from the following link and copy the contents of the RAR file to a fresh, clean rFactor installation. Always use launcher.exe to start the game if you want to get the latest updates for the mod.
F1 2014 Mod v1 – Download Link
IMPORTANT: Make sure to backup any custom modifications to the mod files that you have made, such as plugin settings, camera settings, sounds and so on. The updater will overwrite any existing files that have newer versions.