As of dRofus version 2.12.13, when installing dRofus with the MSI installer, the Archicad Add-On is installed as part of the dRofus Application installation procedure.
Pleas note:
The Add-On installed with the MSI installer will take precedence over any non-MSI installed dRofus, version 2.12.13 or later - i.e. in the presence of an MSI-installed dRofus of version 2.12.13 or later, installing the add-on for ArchiCAD from within dRofus will not have any effect. In this respect we do not recommend installing both MSI and non-MSI versions side-by-side.