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Install java with the java.exe file. Run the jarfix.exe file after. Then install Minecraft forge with the forge-1.12.2.jar file. Press Windows Key + r then type appdata then press enter. Click Roaming then click .Minecraft then open the "mods" folder. If you don't have a mods folder, create one. Open the mods folder, create a folder called 1.12.2, and open it. Move all the files in the "mods" folder in the zip you downloaded into the 1.12.2 folder. Open Minecraft forge 1.12.2 and the mods will work.