¶ Minecraft: How to Change Forge Versions
If you have a modpack that requires a specific version of Forge, or you want to play an older version for any reason, you can use these steps to launch your server in the proper version.
¶ Steps:
1. Open the Change Server Type tab and change it to Forge if it is not set already.
2. Open the Change Version tab and switch the dropdown to your preferred version of Minecraft.
3. The recommended version of Forge will automatically install for the version selected.