In that case, the instructions would involve downloading the .img file, using a tool to extract or apply the mod, and then running the game. However, this requires technical knowledge and might void any support from the developers.
I should outline steps if applicable, but first, check if the file exists as an official patch. If not, then the user is likely entering unregulated territory with potential risks.
I should also consider the legality here. Downloading cracked or pirated content is illegal and unsupported. The user might not be aware of that, so the response should avoid promoting piracy. Instead, directing them to official channels if possible.