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Clicking on Next again will continue the process and let you choose which features of the Maxwell Render Revit plugin you want to install. Clicking on Install will complete the process and start the installation.
Silent Windows install
The plug-in can be installed silently by passing the /S flag on the command line:
maxwell_revit_3.0.1.exe /S
In this mode, the installer will use the autodetected directories and will not ask any questions.