1. Download and install MultiMC at https://files.multimc.org/downloads/mmc-stable-win32.zip.
2. Add new instance of any Minecraft version you want.
3. Download mod-worlddownloader-baseedit file on https://github.com/Pokechu22/WorldDownloader/releases for Minecraft version that you've selected in the previous step.
4. Click on instance that you've made in MultiMC Launcher and click on "Edit instance".
5. Go to the version tab.
6. Click on "Add to Minecraft.jar"
7. Select file that you've downloaded in step 3.
8. Launch the instance and you're done!
2. Add new instance of any Minecraft version you want.
3. Download mod-worlddownloader-baseedit file on https://github.com/Pokechu22/WorldDownloader/releases for Minecraft version that you've selected in the previous step.
4. Click on instance that you've made in MultiMC Launcher and click on "Edit instance".
5. Go to the version tab.
6. Click on "Add to Minecraft.jar"
7. Select file that you've downloaded in step 3.
8. Launch the instance and you're done!