Bug 488499

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SUMMARY
The following versions 3.6.9, 3.7.0, 3.71 can't be installed on macOS Big Sur.

STEPS TO REPRODUCE
1. Download the latest version of KStars on a Intel Mac under macOS Big Sur
2. 
3. 

OBSERVED RESULT
Try to mount the dmg : no avail

EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: macOS Big Sur 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
I installed macOS Big Sur on a brand new SSD and I downloaded the versions of KStars 3.6.9, 3.7.0, 3.7.1
There is no way to install KStars ≥ 3.6.8. (3.6.8 works perfectly)

When I double-click on the kstars-3.7.1.dmg I get a system warning :
The following disk images couldn't be opened
kstars-3.7.1.dmg          no mountable file systems

As a résumé :
- KStars ≤ 368 works perfectly on my Macs
- the dmg of KStars 369 and the dmg of KStars 370 mount as they should placing KStars app in the Applications folder.
BUT KStars app is not functional : an alert appears saying "Check with the developer to make sure kstars works with this version of macOS"
- the dmg of KStars 371 has the problem described above