Yep, Homestuck.com's certs expired.

Gio and Bambosh (the maintainers of the unofficial collection) are both very cool and good, the Homestuck archive is fantastic, and Ruffle (flash emulator that runs in the browser on wasm) is a godsend. Unofficial collection: https://homestuck.giovanh.com/

Unrelated, it turns out the person who made the original Homestuck walkarounds open sourced it back in 2012 (https://github.com/WhatPumpkin/Sburb-Legacy/blob/master/levels/openbound/thirdRoom.xml). She went on to be one of the Rust designers for Mozilla. Rust became pretty influential for WebAssembly, and was used to implement Ruffle... Which made the Homestuck archive possible again.

So it's very fitting that Homestuck's existence ultimately lead to Homestuck's existence. Like that domino meme, but a circle. Or something else...