Hi,I'm still using AutoCAD Civil 3D 2012 and would like to create a custom assembly in Subassembly Composer 2012. Civil 2012-version isn't suportedd anymore so Composer for that version can't be downloaded through Subscription Center. Is there an alternative for downloading Composer?Gregor

Yes - an upgrade. Subassembly Composer is included in Civil 3D since version 2013.