After initial tests with the public release of Apple's macOs Mojave 10.14, we have found no issues with using the Garritan Instruments and the ARIA Player in this environment. If you do encounter any issues or problems when using any of the Garritan products on this OS, please contact MakeMusic Customer Success by Submitting a Request with option above.

Comments
I have. The pkg doesn't open to install the product (Abbey Road Grand)
Martin,
We do expect that the installer will work with this macOS. I saw that you have already submitted a ticket, so I will continue to troubleshoot the issue with you through the case.