Version matching for Minecraft, Forge, Java and older Lost Cities branches. This guide focuses on a repeatable setup process rather than assuming every launcher, modpack or server uses the same files.
Modern documentation baseline
The current official technical documentation covers Minecraft 1.20.1 and newer. Use it as the baseline for modern profile and asset-system behavior.
Forge expectations
The main modern project is documented as a Forge mod. If you find a package labelled for Fabric, treat it as a separate port or third-party project until you verify its source and requirements.
Legacy versions
The Lost Cities mod 1.12.2 belongs to a much older Minecraft ecosystem. Do not copy modern configs or 1.20 branch files into a 1.12.2 instance.
Modpack conflicts
When several mods modify terrain, biomes or structures, isolate problems with a reduced mod list. Add world-generation mods back one at a time and retest new chunks.