RoboPlayz Launcher

A simple, all-in-one launcher for Minecraft that handles Fabric mods for you.

What you need first

• Python 3.9+ installed on your PC (python.org if you don't have it)
• Java 21 or newer installed (needed for the newer Minecraft versions this launcher targets)
• That's it. No other downloads, no extra libraries to install.

How to run it

1. Download the full file as a zip.
2. Extract the zip file.
3. Make sure you get all requirements stated above
4. Double click the PlayMC.bat file.

Thats it then you are all set.

This client features a mod loader

1. It uses the modrinth API and can get dependencies for whatever you mods you add.
2. You can play vanilla or with mods.

Using the launcher

First time setup:

1. Type a username in the "Username" box (anything you want — this is offline play, no account needed).
2. Leave the Minecraft Version and Mod Loader dropdowns on their defaults, unless you know you want something specific.
3. Click Run Setup. This downloads Minecraft and Fabric for the first time — it can take a few minutes depending on your internet.
4. Once setup finishes, click Launch.

That's the whole process. Every time after this, you can just click Launch directly — setup only needs to happen once per version, and the launcher will automatically re-run it if you switch versions or loaders.

Adding mods

1. Go to the Browse Mods box on the left and type a mod name (e.g. "Sodium").
2. Hit Search.
3. Click a result, then click Install Selected.

If that mod needs other mods to work (like a library it depends on), the launcher grabs those automatically too — you don't need to hunt them down yourself.

Your installed mods show up in the Installed Mods box on the right. Click one and use Toggle On/Off to disable it without deleting it, or Remove to delete it for good.

Switching Minecraft versions or mod loaders

Use the dropdowns at the top. Each version + loader combination keeps its own separate set of mods, so switching between them won't mix things up or lose your setup.

If a version you want isn't in the dropdown, tick the Manual box next to it and type the version number in yourself.

Troubleshooting

• "Setup required" won't go away → Click Run Setup, and check the Output box at the bottom for what's happening.
• Java not found / wrong version → Install Java 25+ and make sure it's on your system PATH. On Windows, the launcher can offer to install it for you if your PC has Software Center available.
• A mod isn't showing up in search → Double check it actually supports the Minecraft version and loader you have selected — mods are version and loader specific.
• Something crashed → Check the Output box at the bottom of the window first; it logs what the launcher was doing right before the error.
• IF THERE IS ANY ISSUES OR FEATURES YOU WOULD LIKE, PLEASE DM ME/ or find me irl.

I hope you enjoy!