Thanks bud, I just replied to him, lets see what he says...
@the loop @awesome123man @kazemanie
I fucking solved this shit!
In my case, I have two different drives, primary which is SSD (C:\), secondary is HDD (A:\)
OSRS client keeps installing on A: as I said, this may be the solution for people with two drives who need OSRS client on the other drive.
OSRS installation installs files and client, it puts client on Desktop right. I had my Desktop path on A: which means it's A:\Desktop just to save memory on SSD by having desktop files on A:\ (secondary drive).
I changed the desktop path to C:\Users\""Name""\Desktop and installed the OSRS client, the installation puts client on desktop and now my desktop is in C:\ so it puts all files etc on C:\ instead since installation installed client into C:\.
This is a solution which I was pretty blind to, I came up to this solution after trying to figure out things on bios.
Spread to people with two drives, this may be the solution if they also have desktop path to the drive which they didn't want OSRS client files in.
They just have to change desktop path to the drive they want OSRS client files in.
Took me few days but whatever, atleast I solved this.
Thanks to awesome123man and kazemanie for trying to help me out.