I downloaded and installed the latest ksp (6.0, 64bit), and the corresponding Making History this morning on my Windows machine. Upon installation, Making History gives me an error message: "You are running a version of Kerbal Space Program that is not compatible with the Making History Expansion. Please go to KSP store and download the 1.6.0 version or above."
I have run KSP, and can confirm that I am running version 1.6.0.2395
I also re-downloaded and reinstalled both files this afternoon. Same result.
What gives?