can not install third party software
Try to install a dock for Rand McNally RV GPS and it won't let me. How do you change setting to allow third party software on Mac Mini with Sierra? It worked on older computer.
Perhaps the Gatekeeper has been changed in the later update; though should allow
you to install by your choice to ignore the default setting to let other software install.
•OS X: About Gatekeeper - Apple Support
... About Gatekeeper . ... You can choose the safest option and only allow apps that
come from the Mac App Store to ... or use of third-party websites or ...
//support.apple.com/en-us/HT202491
There are several other points and considerations to check, in the above article.
Good luck & happy trails! 🙂
