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how can you get smaller than or...

What does any of that even mean. 32-bit Windows is still Windows and the majority of installer programs and most other software you use is 32-bit or has 32-bit separate installers. One is not inherently more "trustable" than the other. In fact, 64-bit windows contains the entire 32-bit subsystem inside of it. I mean look at your Program Files (x86) folder and tell me it is not populated.

No? Many/Most Valve games are not "Free" for one... This is also not part of the Source SDK, it is HammUEr not Hammer. It is not modified Hammer, it is a Plugin you drop into UE4. You pay for the ability to put your Source engine maps into UE4