2) Patch your game to version 1.0.1.6 (the last version that is compatible with these beta builds of Counter-Strike)
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2) Patch your game to version [1.0.1.6](./10051016.EXE) as well as [this fix](./1016fix.exe) (the last version that is compatible with these beta builds of Counter-Strike).
3) Download the releases of Counter-Strike you desire below, in the root folder of Half-Life.
4) If you did it right, you should see your mods in the Custom game category within the Half-Life 1 menu.