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Johnanater

Install Fabric/Mixins on legacy with MultiMC (OUTDATED METHOD)

Jan 25th, 2021 (edited)
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  1. How to load Fabric/Mixins on legacy with MultiMC:
  2. (MANUAL, OUT OF DATE, NOT RECOMMENDED ANYMORE)
  3.  
  4. First go to your MultiMC instance, click "Edit Instance", go to the "Version" tab. Click on "Minecraft" and then click "Customize" as well as "Edit" on the right side panel. This will open up a text editor...
  5.  
  6. All we need to do now is add the libraries and set the main class that MultiMC will launch.
  7.  
  8. First, we need to remove the Legacy Launch feature, under "+traits": [, remove the line "legacyLaunch", along with the comma on the line above it.
  9.  
  10. Next add this line to change the main class:
  11. "mainClass": "net.fabricmc.loader.launch.knot.KnotClient", - This can go below the "name": "Minecraft", line. (After line 23 on b1.7.3)
  12.  
  13. Right below it, add this line
  14. "minecraftArguments": "--username ${auth_player_name} --session ${auth_session}",
  15.  
  16. Now for the libraries, including Earthcomputer's custom Fabric Loader to work on Legacy Minecraft
  17.  
  18. The copy paste is too large, so you can copy this from Pastebin: https://pastebin.com/raw/5R3RW6E8
  19.  
  20. Now paste it below the line "version": "b1.7.3" (After line 34 on b1.7.3). Make sure to add a comma at the end of the version line!
  21.  
  22. If you're having issues, I've created a diff that you can find here: https://www.diffchecker.com/WlgbjRPq
  23.  
  24. Now save, and there we go! You've installed Fabric! Now you just need a mod! I've added one for Beta 1.7.3 to this message, simply download it and drag it into the "Loader Mods" section! And tada! You'll see a line in the log saying `Test Mod is here!`. Now, try killing a creeper! :slight_smile:
  25.  
  26. TestMod:
  27. https://cdn.discordapp.com/attachments/459889822291591179/683792270201585675/TestModMixin.jar
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