Subsequent to my post here I found another way to do the same thing but using an app with a GUI rather than having to use unix commands in terminal.
Download this app called Pref Setter here...
Pref Setter Download
Download the Pref files I posted.
1
Start Pref Setter
2
Open one of the Pref files I posted. I would start with the one for ArchiCAD. And open the corresponding plist file in your Preference folder in your Home Library folder.
3
Expand the
InputOutput entry and select the
DisableCrossPlatformMountingFeatures and copy it to the clipboard
4
Click the tab to display your plist file and look for the
InputOutput entry and expand it.
5
Select the
FileCacheSize entry and right click it and select Add New Key see screenshot below.
6
Replace the text
New Key by selecting it and pasting the clipboard contents
DisableCrossPlatformMountingFeatures
7
Next change the entry
String to
Boolean
8
then double click
false and it will change to
true.
9
Save and quit
Pref Setter startup ArchiCAD and it should be working.
Repeat for PlotMaker.
AC versions 3.41 to 25 (UKI Full 5005).
Using AC25 5005 UKI FULL
Mac OSX 10.15.7 (19G2021) Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics