If you already own Kerbal Space Program legally, you do not need to turn to sketchy download sites to play historical versions.
That being said, if you're looking to download Kerbal Space Program 1.0.5 for free, here are a few options: ksp kerbal space program 015 download free
While basic, this update laid the groundwork for letting Kerbals leave their pods and walk around. If you already own Kerbal Space Program legally,