Previous Version support allows Suite or Point Product licenses to only consume a single license for every application from the same release year. These concepts apply to all Autodesk products.
The best way to illustrate the versioning support by year is to use an sample scenario:
5 x Revit Architecture Suite 2012 on Subscription. You will be able to run 2012, 2011, 2010 and 2009 versions of the software included in Revit Architecture Suite 2012 (AutoCAD, AutoCAD Architecture & Revit Architecture).
The following conditions are true:
Run 1 x AutoCAD 2009 and 1 x AutoCAD 2012 on the same computer, it will use 2 licenses of Revit Architecture Suite 2012.
Run 1 x 2012 AutoCAD, 1 x 2012 Revit Architecture and 1 x 2012 AutoCAD Architecture on the same computer, it will use only 1 license of Revit Architecture Suite.
5 x AutoCAD 2012 on Subscription, You can run 2012, 2011, 2010 and 2009 versions of the software
The following conditions are true:
Run 1 x AutoCAD 2009 and 1 x AutoCAD 2012 on the same computer, it will use 2 licenses of AutoCAD 2012.
These Technical Solutions mention previous versioning support here:
Understanding Previous Version support for Autodesk Suite products
http://usa.autodesk.com/getdoc/id=TS16961119
Understanding Previous Version support for Autodesk Point products
http://usa.autodesk.com/getdoc/id=TS1085008
License Consumption
Previous Version support allows Suite licenses to only consume a single license for every application from the same release year of the Suite. If the Autodesk Suite product did not exist in the previous year then each previous version of a product that is launched will consume a separate license. Since no Autodesk Suites exist prior to the 2011 release year, launching a previous version of all 2010 and 2009 products will always consume one license each.
For example, if you have a package license for Autodesk Design Suite Premium 2012, the following scenarios can be expected:
- Running AutoCAD 2012, 3ds Max Design 2012, and Mudbox 2012, on the same workstation and at the same time, only consumes one license.
- Running Showcase 2011 and Mudbox 2011, on the same workstation and at the same time, also only consumes one license because there is a 2011 version of Autodesk Design Suite Premium.
- Running AutoCAD 2010 and 3ds Max Design 2010, on the same workstation at the same time, consumes two licenses (one for each product) because there was no version of Autodesk Design Suite Premium 2010.
External References:
http://blog.jtbworld.com/2011/05/prior-version-support-and-license-usage.html
Epilogue
The following conditions are true in this scenario as well. If you have you have 2 x Revit MEP Suite 2012 license, on the client workstation, if yourstart:
- Revit MEP 2012 and Revit MEP 2011, it will use two licenses.
- Revit MEP 2012 and AutoCAD MEP 2011 will use two licenses.
- Revit MEP 2012 and AutoCAD MEP 2012 will use one license.





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