If you’re interested in KSP 1.12.5 legitimately, it’s best to get it via Steam or GOG (often on sale for ~$10-15). If you saw an article claiming to offer a free .rar of that version, treat it as suspicious.
Since the game doesn't require a constant connection to a digital storefront, an archived version can be moved between a desktop and a laptop for "offline" rocket science. kerbalspaceprogramv1125rar
To download and install Kerbal Space Program v1.1.2.5 RAR, follow these steps: If you’re interested in KSP 1
file from third-party sites may contain malware, spyware, or ransomware. Version Context To download and install Kerbal Space Program v1
While that specific filename often appears on file-sharing or archive sites,
The most straightforward tool for macOS is The Unarchiver, which is free and available on the Mac App Store. It can handle .rar files among others.
is a physics-based space flight simulation developed by the Mexican studio