Third-party "ZIP" downloads are often used to distribute malware or unwanted software. Reports indicate that some KSP files have triggered "Trojan" alerts in antivirus software like Windows Defender or Avast, though these are frequently false positives related to how the software monitors file behavior (heuristics).
As of early 2025, official direct download portals for ZIP files have faced significant changes. DOWNLOAD FILE – Kerbal Space Program 2.zip
If you have already downloaded the file, you can verify its safety by dragging and dropping it into VirusTotal for a multi-engine scan. Alternatively, tools like WinZip have built-in "Scan for Threats" features. Official Distribution Status Third-party "ZIP" downloads are often used to distribute