Open the AstralRinth releases page and grab the newest release for your system:
.msi (or .exe) installer.dmg file.AppImage, .deb or .rpm, whatever fits your distroRun the downloaded installer and go through it like any other app, then launch AstralRinth. It looks and works almost exactly like the official Modrinth App — same layout, same flow — so anything written about the Modrinth App applies here too.
Click the account icon in the top-right corner of AstralRinth, choose the offline account option, and type the username you want to play under. That's the whole sign-in — no Microsoft login needed.
Click the download button on the Frost homepage, pick your renderer (Vulkan or OpenGL) and Minecraft version, and you'll be redirected to Modrinth — download the .mrpack file from there.
Not sure which renderer to pick? Start with Vulkan for the best FPS; if it won't launch on your system, the OpenGL build works everywhere. More on this in the FAQ.
Double-click the downloaded .mrpack file. AstralRinth picks it up automatically and installs Frost as a new instance — mods, configs, everything included, no manual setup.
If double-clicking opens something else (or nothing), open AstralRinth, hit the + button to add an instance, choose From file, and select the .mrpack there instead.
Once the install finishes, Frost shows up as an instance on the AstralRinth home screen. Select it, press Play, and you're in — with your offline account from step 3.
Come find us on Discord — that's where the team and community hang out and where support happens fastest.