Go here Combat Arms Hacks - MPGH - MultiPlayer Game Hacking
Scroll down until you find a working hack. One that doesn't have [patched] or [detected] next to it's name. I recommend you use https://www.mpgh.net/forum/164-combat...kick-more.html
Scroll down in that first post until you find the download, and then download it.
Extract the download with winrar until you have a .dll file.
Download this injector
https://www.mpgh.net/forum/292-combat...ot-packed.html
Open that up as admin, set process to Engine.exe and click browse, find the hack .dll file you just got and click ok.
then start up combat arms.