Hi Alice,

Hold Control key down,  click on the downloaded QGIS app, and choose "Open"
then give permission to run it

This only has to be done the first time, thereafter MacOS remembers that you authorized that specific program and will start it without quibbling. However, if you download a new QGIS you will be required to do the Control-click followed by Open to authorize that version.

You are running into Apple's security which balks, unless specifically OKed by you, programs that aren't signed by Apple or an officially authorized developer...

Garth Fletcher

On 2/20/24 1:44 PM, [email protected] wrote:
Looking for some urgent help!
I am desperately trying to get a QGIS project done this week so need
help to get it back asap!!

Was having issues with QGIS with unexpected crashes on my iMac so
decided to try and do an update and install the latest long term release
  version from the website (3.28).
However, it gives this error (attached) whenever I try and open the
installed software.
?Apple cannot open QGIS-LTR because it cannot check it for malicious
software
This software needs to be updated
Contact the developer for more information?.

My IT tech support team have tried in vain to uninstall and re-install
it for me, with the same results.

Please let me know how I can overcome this error and get QGIS back on my
  iMac.

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