What are your PC specs? As far as I know, to play normally, you should have 16 GB of RAM and a good video card. Yes, you can download the mod for cs 2 here
https://all-cs.ru/. This is not a full version of cs 2 itself, but nevertheless there are redesigned cool weapons, with an inspection function when pressing the F key, as well as improved interface and texture quality. I think you will like it, if anything, write your impressions of the mod pack.