"Offline" Minecraft Install Guide

Tested with Minecraft 1.20.1 and Prism 7.2

Install Prism Launcher

Use Prism Launcher.

  • It allows you to manage multiple installs of minecraft as well as installing and managing mods of every kind.
  • It's an open source fork of MultiMC (made unofficially by one of the Minecraft developers).
  • It's NOT some dodgy hacked client likely to give you a virus.

You may need to install a Java Runtime Enviroment

Prism won't install a JRE for you, unlike the official launcher.
Minecraft requires a JRE to work and it is no longer distributed as installable package as was the case with Java 8. Instead you can install a JDK (Development Kit) distrubtion. Prism's docs recommend Adoptium or Azul.

  • Install JDK 17 or higher.

Apply the "Crack"

First Make sure the Prism Launcher is closed.
Make the file accounts.json

{
    "accounts": [
        {
            "entitlement": {
                "canPlayMinecraft": true,
                "ownsMinecraft": true
            },
            "msa-client-id": "",
            "profile": {
                "capes": [
                ],
                "id": "55555555555555555555555555555555",
                "name": "DONNOTUSE",
                "skin": {
                    "id": "",
                    "url": "",
                    "variant": ""
                }
            },
            "type": "MSA",
            "ygg": {
                "extra": {
                    "clientToken": "55555555555555555555555555555555",
                    "userName": "DONNOTUSE"
                },
                "iat": 1692073118,
                "token": "0"
            }
        }
    ],
    "formatVersion": 3
}

And put it in the same folder you unzipped Prism into (portable) or %appdata%/PrismLauncher/ (if you used the installer).

Yep, it's a just a configuration file.

Create a new Account ( follow carefully )

  • Top right corner of the window: Click "Accounts" -> "Manage Accounts".
  • Rightside "Add Offline" ...choose a name etc.
  • Select it and "Set Default" , Now you can avoid using the DONOTUSE account.
    Back in the main window

Play online

You can now play on servers that are (ironically) in "offline mode".

  • Create an instance "Add instance", maybe install a modpack or two.
  • Select an "instance" (minecraft setup) and Launch

If you have any problems following these steps.

  • Use task manager to kill prismlauncher.exe ( in "details" tab)
  • Delete and remake the accounts.json
    ...and you should be able to able to redo "Create a new Account" steps.

You've won at Minecraft.

Make an offline server

If you already know how to setup a server, then this will make it available to "offline" accounts.
Be warned: anyone with your server address can join with what ever name they choose.
Just modify the server.properties in your minecraft server folder. Vanilla, PaperMC, Spigot, etc: they all have this file.
Change the line online-mode=true to online-mode=false.

Edit Report
Pub: 15 Aug 2023 04:49 UTC
Edit: 15 Aug 2023 06:49 UTC
Views: 148