I'd imagine you can just run it like normal, they haven't actually created a modified client have they? Not even steam would be that retarded, someone please tell me they aren't that retarded.
Failing that, copy pak0.pk3 from your installation to a folder with a path like this: q3\baseq3\pak0.pk3 (the first q3 part can be named anything) and download and run the 1.32 point release giving it the path you created.