Player setup

Installation

The whole thing takes a couple of minutes. No strange ritual required.

Launcher

Use Prism Launcher or another launcher that understands Modrinth packs properly.

Java

Java 21 is required. Most launchers sort this out for you without any drama.

Memory

6 GB is the floor. 8 GB is the sensible target if you want the pack to feel smooth.

Getting the pack in

Install it once, let the launcher do the heavy lifting

1

Download the pack

Head to the home page and hit Download latest. Save the .mrpack somewhere you will find again.

2

Import it into Prism

Open Prism Launcher, choose Add Instance, then Import, and point it at the pack file.

3

Hit play

The first launch downloads the actual mods. After that, Minecraft opens and you are off.

The first launch takes longer because it is fetching 128 mods. That is normal. Make a cup of tea and let it finish.

Keep it civilised

Give it enough memory

If the game stutters or falls over with an out-of-memory error, set the Java memory allocation to 8192 MB in your launcher.

Do not fling silly amounts of RAM at it unless you have a clear reason. More memory is not automatically better, and oversized heaps often make Java feel worse rather than better.

Updating

When a new version comes out

The easiest route is still the least fussy one: download the new .mrpack and use Update from file in Prism Launcher.

  1. Download the latest .mrpack.
  2. Right-click the Thunder instance and choose Edit.
  3. Use Update from file and select the new pack file.

That keeps your saves and settings in place while refreshing the pack itself.

Windows users can wire in a Prism pre-launch command if they want a more automated setup:

powershell.exe -NoProfile -ExecutionPolicy Bypass -File "$INST_MC_DIR\update.ps1" -PackwizSide client

That works cleanly because update.ps1 now defaults to its own folder when no directory is supplied, and will use Prism Launcher's $INST_JAVA binary automatically when it is available. Linux or macOS client sync is still best treated as a custom arrangement rather than the official one-click route.