1. Prepare a separate profile
In the Minecraft Launcher, create an installation for the required game version and run it once. A separate game directory keeps the test isolated from important worlds and unrelated mods.
2. Install matching Forge
Download Forge from its legitimate source and choose the build made for the exact Minecraft version. Complete the client installation, then select the new Forge profile in the launcher.
3. Add the mod file
Run the Forge profile once so its folders exist. Open its game directory, locate or create the mods folder and copy the intact compatible .jar into it. Do not rename it to another format or extract it.
4. Verify and test
- Launch the Forge profile.
- Check the Mods list for the expected entry.
- Create a separate world.
- Confirm the documented spawn method.
- If it fails, capture the exact error and latest log before changing files.
Frequently asked questions
Where is the mods folder?+
It is inside the game directory used by the selected launcher profile; a custom profile may not use the default .minecraft location.
Why does normal Minecraft launch without the mod?+
You likely opened the standard profile instead of the matching Forge profile.