Did you play 1 and 2 original or remastered? I'm wondering if the remastered version is worth it and if it makes the HW1 levels more 3D (many of the levels', until near the end at least, elements were still mostly on a flat horizontal plane, which I found to be disappointing).
I tried that game and just couldn't handle the mouse cursor when attacking; the height art for it is just bizarre to me. I also hated various gameplay issues in SurrounDead. I hope ZERO Sievert may scratch this itch.
It's pointless; you can have both sides download PeaZip (which, FYI, is superior to 7-Zip because it's cross-platform instead of being Windows-only) and run part splicers; easy workaround. This only adds to the problem of yet another non-E2E service in the running.
Items at some libraries: