Oh my lord guys, I finally got it working... THANK GOD! Here's my solution, please let me know if it works for you too!
1. Go to your main GTA V directoy where the RPH.exe is located
2. Right click on a blank space in the directory and click properties (Not on a file, but on a blank space
3. Uncheck the read-only mode and then click apply to all folders and subfolders
4. Wait and then launch the game using the RPH.exe
5. Enjoy and then cry because you've been trying to fix it for a year! lol
Hope I could help at least one other person!
Thanks,
-Nick M