Install Optium in GDLauncher
Optium runs on Fabric. Pick whichever your existing instance uses, or create a new one. GDLauncher installs the correct loader automatically.
Install on Fabric
- Open GDLauncher and create a new instance (the + button on the Library page).
- Pick the Fabric loader and a Minecraft version that Optium supports (1.21, 1.20.4, 1.19.4 are common choices).
- Open the new instance, go to the Addons tab, and click Add Addons.
- Paste the Quick Install ID
#optium, find Optium in the results, and hit Download. GDLauncher pulls dependencies automatically. - Hit Play. That's it.
Before you install
Make sure your Minecraft version matches what Optium supports. As of the latest release, 1.21, 1.20.4, 1.19.4 are supported. Optium only runs on Fabric; mods built for other loaders won't work. GDLauncher checks compatibility for you and won't install something incompatible with the instance you've chosen.
Frequently Asked Questions
Is Optium free?
Yes. Optium is free to download and install through GDLauncher. GDLauncher itself is also free and ad-free.
What Minecraft versions does Optium support?
Optium supports Minecraft 1.21, 1.20.4, 1.19.4, 1.18.2. GDLauncher will automatically pick a compatible version when you install it.
Does Optium require Forge or Fabric?
Optium requires Fabric. GDLauncher will install the correct loader automatically when you create an instance.
How do I install Optium?
Open GDLauncher, go to your instance's Addons tab, click Add Addons, and paste the Quick Install ID #optium. GDLauncher handles dependencies and the right Minecraft version automatically.
Who made Optium?
Optium is made by Smailes. The full project lives on Modrinth (https://modrinth.com/modpack/optium).
Need help?
Read our troubleshooting guide, check the guides section, or join the GDLauncher Discord community.