If you have this version legally, you can mod it safely using tools like and OpenIV .
Official PC versions now include next-gen features previously exclusive to consoles, such as ray-traced shadows and reflections. Third-Party Note
For those using the 1.0.2545 build for modding, it is often preferred because older builds are sometimes more compatible with specific scripts or "Script Hook V" versions before Rockstar's more recent BattlEye Anti-Cheat implementations.
This version requires specific versions of Script Hook V to run custom mods.