Your time is more valuable than wrestling with DLL injectors.
Using on Windows 10 puts you in a grey area. While Far Cry 4’s dual-core restriction is anti-consumer and arbitrary, modifying the game’s runtime violates Ubisoft’s EULA. You will not get banned (it’s a single-player game), but you are exposing your system to potential malware if you download from untrusted sources. i--- Far Cry 4 Dual Core Fix Extreme Injector Windows 10
The Processor That Wouldn’t Run Kyrat