First download the binaries from https://developer.novell.com/wiki/index.php/ActiveX_NDAP_Controls.
Register the following files via regsvr32 or just copy them in the same directory as where you install the groupimport.exe and settings.ini:
Unzip the groupimport.zip and install via setup.exe.
Open the folder where you installed the groupimport.exe
Open the settings.ini.
Change the tree name to yours.