Because KSP will no longer receive official updates, your v1.12.4 GOG installation acts as a perfect digital time capsule. Your heavily modded saves will never be broken by an unexpected patch.
Install the game via GOG Galaxy or the installer to a path like C:\KSP_Root\ . Never modify this folder.
The foundational backend mod required to patch, alter, and inject custom behaviors into parts seamlessly. Best Visual Overhauls
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Version 1.12 has much lower system requirements than KSP 2, making it the "best" version for those without high-end gaming rigs.
Buy the GOG version. Download the offline backup installer. Store it on an external hard drive. Install the game to a custom folder. Add CKAN mod manager. Never worry about updates or DRM again. Because KSP will no longer receive official updates, your v1
PHYSICS_FRAME_DT_LIMIT = 0.03 : Tightens the physics engine limits. If your game slows down during large part-count launches, changing this between 0.03 and 0.05 balances real-time clock speed with physics precision.
GOG allows you to easily duplicate your clean vanilla v1.12.4 folder. You can maintain one pure vanilla game, one heavily modded visual playthrough, and another dedicated entirely to hardcore realism overhauls. Step 1: Optimizing the Clean Installation
While KSP 2 floundered and the original KSP’s final official update was 1.12.5, many veteran players and mod authors consider the “golden release.” It arrived after years of bug fixes, the addition of colonies, history packs, and quality-of-life features — yet before a few minor late patches that introduced rare part-clipping or UI glitches for some mod setups. Never modify this folder
…all officially supported 1.12.x, with many modders quietly confirming that was their personal development target. Fewer “silent errors” than 1.12.5.
Kerbal Space Program Taught Me More Than My Engineering Degree
This is the first thing you should download. It manages all your mods and ensures they are compatible with v1.12.4. Kerbal Engineer Redux (KER):