Apple cannot check 2.2.6 for malicious softwares

[JJ]

Hi there,

I'm trying to install TurboVNC for macOS (version 2.2.6). After verifying the DMG signature, It still says Apple cannot check it for malicious softwares and refuses to open the .pkg file.

Many thanks,

JJ

[DRC]

This is because of Apple's open-source-unfriendly notarization policy. 
For now, you'll have to Ctrl-click the DMG to install it.  I have not
figured out how to incorporate notarization into the official
VirtualGL/TurboVNC automated build workflow, since the notarization
process is asynchronous.

[JJ]

That did the trick, thanks!