I am trying to install QGIS on a MacBook, using MacOS High Sierra Version 10.13.6. For some reason, having installed Python 3.6, my Mac refuses to use the installer saying that QGIS is not a trusted developer. Is there a solution to this?


You may try alternative MacOS QGIS installer by NextGIS. At this moment 2.18.25 QGIS version only. This installer signed and indicated as trusted.

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Disclosure: I'm developer at NextGIS.

  • Thanks a lot, I will try this and get back to you. – Michael Hammond Nov 27 '18 at 13:00

Go to the system preferences and click "security".

Under the general tab you will see a warning towards the bottom of the screen saying something like "[name of program] was blocked from opening". Next to this warning there will be an Open Anyway button.

If you click this the installer will open.

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