If you manage to find a verified build of this mod, you can expect several technical improvements over the 2004 original:
If you are downloading this specific community compilation, you can generally expect the following features pre-configured out of the box: 1. Visual and Audio Overhaul Counter Strike Source 2.5 Fitgirl Repack
Counter-Strike Source 2.5 FitGirl Repack: Everything You Need to Know If you manage to find a verified build
For a nostalgic trip with friends on a LAN, a repack might work, but for the best and safest experience, consider supporting the official release on Steam. The choice, ultimately, is yours. a repack might work