This fix applies to MultiMC launcher only. Loading the instance in 1.0.0 and then the desired version also fixes this issue. All that is contained in this file is the options of the player from the escape menu. To fix you can either enter the text file and change the lang= parameter to the capitalized version or just delete the options.txt file because a new one will be created and it is already basically reset in earlier versions (hence why Auto-Jump always turns back on for example). The options.txt during the aforementioned range cannot read this language and so causes a crash immediately after starting. The lang= parameter in the text file is expecting en_US, en_UK, or another uppercase language code but if the last played version was 16w32a (1.11 snapshot) or later the lang= parameter is changed to en_us, en_uk, or another lowercase language code.

This is because of the options.txt in the. Loading a version from 11w49a (1.1 snapshot) to 13w26a (1.6 snapshot) will often cause a crash.

For other versions you may need to check the 'Snapshots' or 'Historical' checkboxes in the launcher.

This 'joke version' appears under the name 'release 2.0' between 'release 1.5.1' and 'release 1.5.2'. Create the directory '2.0' and place the jar and json files there.Īfter that open the launcher, add a new installation and find the added version. You can help the Minecraft Discontinued Features wiki by expanding or improving it.Ĭreate a directory under '~/.minecraft/versions' with your desired version, and place the jar and json files there.įor example, to install the Java Edition 2.0 (the first of the April Fools versions).

Minecraft launcher custom jar