Yes, if you install this you can still play normal CS. This is just a script that you can run optionaly if you wish.
And just to clarify, CS:S is not a mod of HL2 because it uses the HL2 engine (Source), it is a mod of HL2 because it uses the HL2 SDK. Lot's of games use the same engine, but they are not mods, they are games in their own right.
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