Help with AlterIWNET

Hello,
I used to play COD MW2 via Steam although I then used GSC Modifications and got banned.. So I turned to AlterIWnet, I want to know if it is possible to be able to use GSC Modifications now as I found them very fun.

I did search around and I found an injector, but it told me to replace my Steam_api.dll and the version provided was an older version and with that I could not use the game. So if anybody could help me with GSC Modifications I'd appreciate it.

Thank you ! Such an easy post to find and I missed it, Sorry.