To run this specific file, your Minecraft installation must meet the following criteria: : 1.12.2 (Legacy Java Edition).
Version represents the last time Minecraft modding was "simple" – before the split between Forge and Fabric, before the data-driven JSON changes of 1.13, before Java 16+ broke half the ecosystem. Files like Fapcraft-Mod-v1.1-Forge-1.12.2.jar are time capsules. They contain coding practices (using IExtendedEntityProperties instead of Capabilities, raw GL11 rendering, etc.) that are now obsolete.
: The mod is intended strictly for adult audiences, introducing characters and Non-Player Characters (NPCs) capable of explicit interactions. Character Interactions