Mac App Store and identified developers.

Gatekeeper is built in Security option in OS X Mountain Lion that prevents you from running potentially harmful applications. If migrating to a new computer please see Transferring data between computers with Apple's Migration Assistant topic of this article below.

Test ARCHICAD and the BIM Server (see BIM Server doesn't start after migrating to Mountain Lion topic of this article below).

Install all current operating system updates and ARCHICAD updates prior to the upgrade.

Allow yourself enough time for the upgrade, do not upgrade the OS close to a deadline.

Return all borrowed licenses before upgrading the OS.

Back up all of your ARCHICAD / BIM Server specific data before upgrading the operating system.

Study this article for any known issues, difficulties.

PlotFlow, which is also a PPC application, won't work either (it is no longer part of the ARCHICAD package from AC15). As a consequence, ARCHICAD10 will be the oldest version running on OS 10.8 Mountain Lion and files created with ARCHICAD 6.0 or older will not open on OS 10.8.

The Rosetta environment that allowed to run programs that were designed for the PowerPC processors was discontinued in OS X 10.7 Lion.

ARCHICAD 9 and older versions cannot be run on Mountain Lion.

ARCHICAD 20 and newer versions are incompatible with Mountain Lion (cannot be installed).

As a result of this there is no official support for operating system specific problems.

ARCHICAD 10-14 versions can be run on Mountain Lion, though these were designed to work with older versions of the operating system.

ARCHICAD 19 can be run on Mountain Lion but it was designed to work correctly with newer versions of the Mac OS X.

GRAPHISOFT is maintaining compatibility for ARCHICAD 15, 16, 17 and 18 and connected products (BIMcloud, BIMx, BIM Server, BIM Server Manager) on OS X 10.8 Mountain Lion.

Mac os 10.8 installer apple