Installing two versions of SolidWorks from 1 disk

I recently bought SW 2012 and was told by SW that I can install 2011 from the same disk and serial number. Does anyone know how to do this? I have a client who needs work done in 11 and seem to be having issues.

3 Answers

It can be done but one has to transfer the license. At the same time, only one copy of SW can be active...

Thanks all for the input. I got it working

Speak in english please..