I'm using one in my game, and I'm not being sponsored (but hopefully someday I will). I'm sure they'd like the promotion of their site in any way possible, so I don't think they would mind you using the Armor Games preloader. As to where to get them? I can't seem to find a place on the new site where you can download them, but if you use Internet Archive's page cache, you can find the old page and download it from there. Here's a link (give it time, it's slow):