Concerning
Mojave
Today I had a customer visit me with a Macbook running Mojave.
At first pscan did nothing.
We waited a few minutes and still nothing.
I asked him to reboot the Macbook.
Then I started XQuartz
Then I started the XQuartx terminal.
From inside the terminal I typed the following commands:-
cd /Applications/pscan.uk
./pscanloader
At this point pscan started working.
He quit pscan, and this time ran it from the XQuartz menu and it worked.
He told me that he had previously set his Mac to be able to run apps that not from the app store.