Hi Alan,

I don't know on which MacOS you are, but I am on MacOS 10.14.6, and never had 
such an issue with my installations of ConTeXt. I looked into my options of the 
so-called Gatekeeper on my machine, and remembered that I have done the 
following:

        go to Apple menu -> Preferences -> Security & Privacy
        on the Security & Privacy, choose the tab General
        there choose, towards the bottom of that pane, under « Allow apps 
downloaded from: » choose  the radio button App Store and identified 
developpers.

Once this is done in principle you should be able to run the scripts install.sh 
or first-setup.sh and then run lmtx or context.

Best regards: OK


> On 15 Nov 2019, at 22:36, Alan Bowen <bowenala...@gmail.com> wrote:
> 
> Though I was able to download the latest ConTeXt beta without any problems, 
> my attempt to update my ConText-LMTX installation was blocked. The error 
> message was
> 
> “mtxrun” cannot be opened because the developer cannot be verified
> macOS cannot verify that this app is free from malware.
> Safari downloaded this file on April 29, 2019.
> 
>  I am not sure why this is happening and wonder if it would OK to copy mxtrun 
> from my ConTeXt installation and replace the version in my ConTeXt-LMTX 
> installation with it.
> 
> Alan
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