In the case of counterstrike, often times at lan parties back in the day lots of people would have different versions. Some would have Source, others 1.6, others didn't have it at all so had to play 1.3.
we found ways of installing a second copy onto all computers that ran 1.3 while the other version, be it 1.6 or source, was still around
so perhaps install the game on a different drive
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