Instead of correctly creating those files here: Since the launcher assumes that the folder specified by the user is the main MC data folder, it creates the fabric jar and json here: It may be safe to assume the folder will always be %appdata%\.minecraft, even though there seems to be ways to change it that I have not tested. Question: How does the installer then find the location of the Vanilla MC data folder?Īnswer: I don't know. It should edit the launcher_profiles.json file located there. It could not find the file because it assumes the folder %appdata%\.testfabric is the main folder for the vanilla launcher, when the main folder is really %appdata%\.minecraft. The fabric installer could not find the file launcher_profiles.json to add the new instance data, so it silently fails. Now I open the MC launcher and the instance I just created using the fabric installer is not listed at all. The install finishes and displays "Done". I check "Create profile" and click install. Now I create a folder %appdata%\testfabric to get around the "no launcher directory found" error and create an instance using the fabric installer, using that folder. "gameDir": "C:\\Users\\username\\AppData\\Roaming\\.testvanilla"
When an instance is created in a different folder, the instance data is still saved inside %appdata%\.minecraft\launcher_profiles.jsonįor example I create an instance and set the game directory to %appdata%\.testvanilla and run the game, create a world, save it, exit the game. When you create a new instance, by default that instance will be "installed" in the default %appdata%\.minecraft, so saved games will be shared among all instances under the %appdata%\.minecraft default folder.Ī user may pick a different folder to install an instance isolated from the default folder, as explained in: The vanilla launcher defaults to %appdata%\.minecraft as the folder where it saves launcher_profiles.json and other folders with common data. TL DR: Instead of trying to fix this, advanced users should just use multimc imho. About the client install, and the "no launcher directory found", there are other problems with the Fabric Installer beyond that error, that I will try to explain.
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