I keep forgetting there was a proper official website because the one I always used and recommended other people to use was https://homestuck.github.io, which is still up and has functional, working downloads. It's even the first result when you search "unofficial homestuck collection" (though this might have something to do with the sudden changes to the main website).

I'm personally taking a neutral stance on the whole issue until we get an official response from someone higher up on Hussie's side (assuming that happens), but I do think the people who are already writing UHC off as lost media are jumping the gun a bit.