In the context of Kerbal Space Program (KSP) , a "DLC unlocker" typically refers to third-party software designed to bypass ownership checks and enable access to paid expansions—Making History and Breaking Ground—without a legitimate purchase.

: A popular Steam-specific unlocker that emulates the Steam API to verify ownership. Koalageddon

1. Run a full antivirus scan using Windows Defender (offline scan), Malwarebytes, or Bitdefender.
2. Verify integrity of game files via Steam (right-click KSP → Properties → Installed Files → Verify).
3. Delete any suspicious DLLs in the KSP folder—especially version.dll, winhttp.dll, or cream_api.ini.
4. Change your passwords for Steam, email, and any other accounts used on that PC.
5. Consider a clean OS reinstall if you ran an unknown .exe as administrator.

Steam CreamAPI: A common generic tool used for many Steam games, including KSP, which intercepts the game's calls to the Steam API and returns a "true" value for DLC ownership.

How to evaluate a mod safely (if you choose mods)

• Prefer well-known sources (CKAN, CurseForge, GitHub) and authors with active communities.
• Read comments, issues, and changelogs for reports of crashes or malware.
• Back up saves and game config before trying new mods.
• Test mods in a fresh profile or separate install to avoid corrupting main saves.
• Keep antivirus and system backups active.