I'd like to buy Rebellion, and I will only buy it if it works through Steam. Here is the official purchase page. If I click on "purchase through Steam" (Which is what I really want to do), I then cannot get my discount. But if I click on the Buy button [Digital Download Only], it brings me to a purchase page with the discount applied. That's great, but I have no experience mixing Steam installs with non-Steam mods.

If I buy it from this store and not Steam, and I need to reinstall in the future, will I need to come to this website to redownload? Can I reinstall through Steam, even though I bought it from this website? How does this work.

I believe $40 is too much, but this discount makes it fair, and I would like to get it.