Right-click your game launcher icon and select Run as administrator to grant full read/write privileges.
The build is one of the most vital milestones for the game, colloquially tied to the stable era of the massive "Living Large" 2.0 update. While it brought over 800 bug fixes and added highly requested base-building pieces from Below Zero, subsequent minor security and Unity engine patches completely broke mod compatibility. If your favorite modpacks or the popular Nitrox Multiplayer Mod stopped working due to game version mismatches or download failures, you are not alone.
Use the Steam "depot" system to request the specific build files for v71288.
If your game crashes immediately upon startup after installing several mods, the likely culprit is Nautilus , the core modding library used by many other mods.
Steam will automatically download the v71288 files. Once finished, your game will be locked to this stable version, preventing automatic updates from breaking your mods. Advanced Fix: Using Steam Console (The "Depot" Method)