SDC can be obtained from here: http://sd.stardock.com/sdcentral_setup.exe
What I would suggest is, if you have apps from SDC that are also available via Impulse, restore them using SDC and then use the archive feature in Impulse to create an Impulse archive file.
To do this, right cilck on the app in Impulse and choose 'Archive Application'. To access where the archive gets saved, hold the shift key and then click the blue ? in the upper right corner of Impulse. Click 'Open Impulse ProgramData folder' and then double click to open the 'Backup' folder.