Hi Well, straight forward it is just like before. (uninstall the older version, restart computer, install the new one and restart computer again ...) BUT, this time I also run the 'BatChmod' software that is used precisely for this very purpose of problematic permission, and that solved the problem....

Hello Unfortunately, the AU plugin (MIDI Expression Quattro v2.8.2.11) does not work with Logic 10.4.8 nor any other software on my MAC (Mojave 10.14.6) The VST is OK, but Logic does not work with VST ... Is there any chance for an update that fixes the problem? Logic always make a test to installed...