(You have to properly set the proxy port if you changed it in the Python script) What does it fix? Indev and Infdev generation When you have selected the version, you will have to click the 'More options' button, and add this at the end of the 'JVM Arguments' section: (Indev and Infdev are near the bottom of the list, prefixed by old_alpha) The final step is to create a new installation in the Minecraft Launcher, you simply need to create a new one like usual (making sure Historical versions are enabled), and select the version you just downloaded. minecraft/versions/.įor example, if you want to play Infdev 20100227, you'll need to download the required files, and place them under. json from a known source such as the Minecraft Wiki, and place those two files in. Be aware that Indev and Infdev versions are not available in the official Minecraft Launcher, so you will need to download a. You will now have to download a Minecraft version that you want to test. You can customize this by changing the PROXY_PORT variable in the Python script in /Lib/site-packages/indevproxy. At this point, the proxy is running on the port 8084 of your machine.