Thx for the info but I do not have this problem on my Macbook with OSX 10.11.6 on which I installed Kstars 2.9.8 without any problems.
I have exactly the same security and privacy settings on my iMac running 10.13.6
I included a screencapture of my settings in my original post.
I just recently upgraded to High Sierra (OSX 10.13.6). I never had any problems installing Kstars with OSX 10.11.6
I am not sure where to find this "enable kstars to be opened anyway" option.
The only options I get are " Allow apps downloaded from:
-Mac App store
-Mac App store and identified developers
-Anywhere

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