Given enough patience, if you look at the version numbers carefully enough, I can guarantee you'll never get into trouble - install major patch first, then you put all the append and add-on into the game.
Can't say much about translation part since I personally understand Japanese, so it's not even a concern to me.
About disk space... well, my installation does not exceed 45GB so I don't see where the heck did that extra 100+GB come from? Mods? You sure you will have time to see that much? DLC? I don't think KISS has that much to offer anyway.
Torrent? Well... as long as there are healthy seeds I don't see a problem. However... if you happen to live in a country which has poor connection... there's not much I can help.
Too bad most of these reasons sums up as a word - "laziness." Which seems to be the true obstacle for anyone to approach this gem. Being complicated doesn't mean it's impossible.
***EDIT***
Oh and, here's COM3D2, a sequel to the original - yes, a SEQUEL to it!
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The douchebag who made this torrent packed it in a rather weird way, just find _setup.7z located in:
Extract the 7Z archive to the root folder and it's a playable game!
So happy to see our maid secretary getting some love she deserves for a long damn time... *sobs*