Hl2 Cinematic

having just read the new zone pc, im very interested in getting this mod for HL2. I've managed to find the files, but as regards the HD addon pack: it says on Fileplanet as I should have a 64-bit OS, but it does not say why. Ive tried to find online, but nothing seems to be about.
will it work with Vista 32 bit?
I know that the current 9.5 mod works, but not sure of the HD addon.

If its 64 bit which means that the module has been designed for HD more graphics, more than 32 bits. This means it will be far from what the requirements of your operating system can provide it, regardless of the quality of your PC.

So in short, it will not work.