Yes, there will be more betas. But I still need to fix some things in the guidance.
I have had this problem yesteday. It was with the newest update of the Atlas ICBM scenario called Altus slio launch. I did not have the newest beta and I got the same thing as you. Then I donwloaded the latest beta and it worked.I tried testing the Atlas ICBM Update after installing the base Beta and got a critical error shutdown. Log report said there was no vessel cfg. file found for the Altus\Elev.
I know it's a beta so I looked thru my install and didn't see any corresponding files to whip up a config file from. Did something get left out ?