7 disc box set for Pc @chonkie

Hello @chonkie ! I checked the link but didn’t see an answer. Just someone with a question similar to mine. Do you have a solution?

Hello!
My name is Pug. I just brought GTA 5 (7 Disc box) from Walmart. How do I instal mod such as car replacements and clothing. I looked for videos to assist with this issue on YouTube, but there all dedicated for those who use the Steam application. Can anyone point me in the right direction?