Use the Steam Console or Depot Downloader. However, the easiest method is to use the Beta branch selector mentioned above to roll back.
If you have completed your KSP 1.12 download but the game crashes on launch, follow this checklist:
For DRM-free users, GOG provides offline installers. Ksp 1.12 Download
| Mod Name | What It Does | 1.12 Compatible? | | :--- | :--- | :--- | | CKAN | Mod manager. Installs/uninstalls mods automatically. | Yes | | Kerbal Engineer Redux (KER) | Shows delta-V, TWR, orbital data in real-time. | Yes | | MechJeb 2 | Autopilot for ascents, landings, docking. | Yes | | BetterTimeWarp | Allows faster time warp (up to 100x). | Yes | | RCS Build Aid | Balances thrusters before launch. | Yes |
You may see three variations: 1.12.0, 1.12.3, and 1.12.5. For 99% of players, 1.12.3 is the best compromise for mod compatibility. The final patch (1.12.5) introduced minor localization fixes but broke several popular visual mods (like Scatterer and EVE). Use the Steam Console or Depot Downloader
When searching for a KSP 1.12 download for modding, target version 1.12.3. You can find this via the Steam "Betas" tab under "1.12.3 - Legacy Modding Support."
Yes – recommended.
Most mods require 1.12.x. Match your exact minor version to mod requirements (1.12.0, 1.12.2, 1.12.5).
Popular mods (e.g., Kerbal Engineer, MechJeb, Restock, Near Future Technologies) all work perfectly with 1.12. Pro tip : Use CKAN – it will
Pro tip: Use CKAN – it will automatically filter mods for your exact KSP 1.12 version.
Because KSP is a premium game, you cannot legally download the full version for free from third-party sites. You must access the download through the platform where you purchased the license.
KSP 1.12 is a mature platform with a massive modding library. If this is your first time playing 1.12, you should install the "Holy Trinity" of mods to fix minor bugs and improve gameplay.