I only know this pack works with Prism Launcher, but you can try other launchers. The setup guide is tailored for Prism Launcher.
- Download the pack (in Releases, on the right of this page)
- Install prism if you havent already (https://prismlauncher.org)
- Install Adoptium's JDK 17 (Click Latest LTS Release here: https://adoptium.net)
- Import the pack to Prism Launcher (Open prism, click Add Instance, click Import from Zip, click "Browse", and select the .zip file you downloaded from this GitHub repo (Downloads folder))
- Once its done importing, click "Edit" on the right pane of the Prism Launcher window and click the "Settings" tab
- Click "Auto-detect" and select any item on the list that says its version is 17.x.x.
- Save, and launch the pack when you're ready. The SMP is already in the multiplayer tab!