Extract contents to your cstrike folder.

Than open the cstrike/materials/models/player/t_arctic folder.

You will notice 2 folders.

One says white, one says blue. Open the folder containing the player skin you want.

Right click/COPY the t_arctic.vtf that you want.  Back up one file so that you are in the t_arctic folder again.  Right click/Paste.  If it asks you to overwrite, do so.  