The original steps weren't as clear as I wish they would be. Maybe due to a language barrier. There also are steps missing such as renaming a specific file. Modding this game can be fun and something like the UnityExplorer mod makes reversing this game a lot easier. So here are the properly described steps to get MelonLoader working on ROTMG.
- Make sure you launched the game before at least once. This has to be done in order for the game client to be on your disk. The Unity "game" you see in the Steam installation or the Webinstaller's default installation folder, is only the launcher.
- Navigate to
C:\Users\...\Documents\RealmOfTheMadGod\Production. This is where the game client is located at. Installing MelonLoader on the launcher is useless. - Download "multitool.exe" from the RealmStock website. Place it next to the "RotMG Exalt.exe" in the production folder. This is important. Since we have to launch the game through the multitool from now on when we want to execute it together with the MelonLoader.
- Download the MelonLoader installer from their release page.
- Install MelonLoader on the "multitool.exe" (not "RotMG Exalt.exe") located next to the game client.
- Rename "version.dll" (500kb) into "winmm.dll". The game will otherwise replace that file with the one from the game (6MB).
- Launch the game through the multi-login feature of the multitool and let it run into the metadata error (MelonLoader console).
- Create a "Fix" (case sensitive) folder in the production one.
- Copy everything in the production folder into the fix folder.
- Download this repository. Paste everything from the download into the
C:\Users\...\Documents\RealmOfTheMadGod\Production\Fix\MelonLoaderfolder. You should know what I mean. The folder names will match. - You are done. Use the multitool in the fix folder from now on. Launching the game through the multi-login feature of the multitool should not run into the corrupted metadata error anymore.
- Have fun modding this game. I hope these steps are more clear to you than the ones in the original repository.
Credits: @mimination