I'm on OpenBSD.You can download the most recent version from Flathub or Steam, if you're on Linux.
I will wait for the new version, no rush, as I was able to go past this problem, and continue playing. I am now on Sky Kingdom mission. It's a great campaign, worth playing, many thanks for your work! 
Statistics: Posted by kjRwN4Sf1N — Today, 9:50 am