Auto-installs the modpack
Java, Fabric loader, and the exact FoundryMTR mod set — installed and pinned for you.
The product
FoundryMTR Launcher
One click from desktop to server. It installs the modpack, signs you in, and keeps you updated.
Windows v1.0.1 macOS v1.0.1
What it does
Built for FoundryMTR
Microsoft sign-in
Authenticates directly with Microsoft inside the launcher. The website never sees your password.
Automatic updates
Pulls the latest modpack distribution on launch so you’re always in sync with the server.
File verification
Every artifact is checked by size and checksum, and corrupt files are re-downloaded.
One-click play
Starts Minecraft and connects you straight to FoundryMTR.
Open source
A HeliosLauncher fork (MIT) — auditable, with attribution retained.
System requirements
| Windows | Available · v1.0.1 |
|---|---|
| macOS | Available · v1.0.1 |
| Java | Installed automatically by the launcher |
| Disk space | ~2 GB for Minecraft, the modpack, and worlds cache |
| Network | Broadband to download the modpack on first run |
Trust & security
Official downloads come only from files.foundrymtr.com, each with a published checksum on the downloads page.
The launcher is currently unsigned on Windows and not notarized on macOS, so SmartScreen / Gatekeeper may warn on first run. Verify the checksum, then allow it. Signing and notarization are tracked on the status page.
Latest release
Current build
The latest promoted launcher build is available on the downloads page with its version, size, checksum, and platform.