talpa

Indeed... I initially just though that the difficulty had just been increased (to the point where it is would be very difficult for me to get small satellites into orbit due to lack funds for upgrades)

The main menu screen actually says 1.0.5.0 I have just redownloaded the KSP zip file the new file has a different MD5 sum than the one I installed from. I will try the new file and report back === EDIT === It still claims to be 1.0.5.0 but after downloading a new .zip file from kerbalspaceprogram.com it now lauches without any problems including realism overhaul