The version of the game would be indicated at the lower-left portion of the screen. You can verify this by going to Minecraft’s main screen. If you are installing Minecraft Forge version 1.12, then you should also have the Minecraft: Java Edition 1.12 installed on your computer. Minecraft Forge requires that you install the same version of Minecraft: Java Edition to your computer for it to run properly. The first thing that you should check if you are having problems installing Minecraft Forge on your computer is the version of the software that you are installing.
