Here you can download Design Manager installation files

Design Manager 2020.0.0.2 works with:
AutoCAD 2000-2019 (32 & 64 bit)
Inventor 2019 (64 bit) 23.3 update (64 bit does NOT work on Windows 8, Windows 10 is OK)

Notes:
1/ Download the Design Manager Setup.Exe and execute it. To specify folders choose 'Advanced Installation'
2/ Release Codes are required to run these applications.
3/ The OLE Object setting for AutoCAD 2018 should be AutoCAD.Application if this does not work use AutoCAD.Application.22
4/ Application Caption setting for R19 is AutoCAD 2019
5/ For full functionality Design Manager requires the AutoCAD VBA enabler to be installed for the version of AutoCAD in use..
6/ If using Windows 7 or 10 we advise you to run Design Manager and AutoCAD/Inventor as Administrator, you can make this setting in the Windows properties for the application under the Compatibility tab. Also turn off UAC.
7/ If the database files are on a Windows server make sure users have EXPLICIT ‘Full Control’ rights over the folder
Membership of a group with rights is not sufficient due to an anomaly with Windows Server and .DBF files.
8/ OLE Object settings for older AutoCAD versions, use AutoCAD.Application.XX and substitute the appropriate number below for XX.X:
R14 = 14.0, 2000 = 15.0, 2002 = 15.0, 2004 = 16.0, 2005 = 16.1, 2006 = 16.2, 2007 = 17.0, 2008 = 17.1, 2009 -= 17.2, 2010 = 18.0, 2011 = 18.1, 2012 = 18.2,
2013 = 19.0, 2014 = 19.1, 2015 = 20.0, 2016 = 20.1, 2017 = 21, 2018 = 22, 2019 = 23




Full Installation, AutoCAD 2019 (32 & 64 bit), Inventor 2019 Version (64 bit)
Updates Design Manager 8 to the latest version, smaller than full installation
Floating License manager installation
Client Server Application
Self running demo of Design Manager
AutoDesk Download page for VBA Enablers
Check here for AutoCAD/Inventor compatibility and bug fixes