[aperson]

Originally Posted by Reach

If we assume that, hypothetically, I wanted to play again and acquire old classic files + whatever might be in the meta nowadays, how might I go about doing that?

Download etterna. Use the pack finder on the site to get all of the old packs (they're all there). Etterna is a Stepmania fork designed for keyboard play and it's what all of the serious 4k players use now.