Some games, especially those not optimized for multi-core processors or older titles, may not run smoothly on dual-core CPUs, especially if they're not Hyper-Threaded. A dual core fix usually involves patches or workarounds that help distribute the game's workload across multiple cores more efficiently.
Do not download from random YouTube links. Search for a trusted source (like GameBurner or CS.RIN.RU) for the following: i far cry 4 dual core fix extreme injector windows 10 repack
If you have a repack installed and the game refuses to launch, follow these steps: Some games, especially those not optimized for multi-core