You can download the patch (44 MB ) and install it at yours CS folder
You download it and install it at yours CS and find HL.exe when the installation is finished a icon will appear on your desktop CS v42 and thats that !!
If this doesnt word download the full CS that is Below !!
If you have the old CS and the patch doesnt work then you download the full v42 CS (270 MB)
http://www.cs-skini.me/csfull/ - Clean CS 1.6 v42
http://www.cs-skini.me/v42/ - KGB GUI