MX SS3 install alongside SS2

I have MX V8iSS2-R2U1 (08.11.07.567) installed on Windows 7 Pro and I am about to install MX V8i SS3 AU (8.11.09.494)

Reading the documentation on Select Services gives me conflicting information.

  • Firstly, the 8.11.09 Readme (Last updated March 6, 2013) states under Directory Structure:

    "SELECTseries 3 supports parallel installation alongside previous versions of MX. This is achieved through 
    the use of different installation path that includes the product version name. By default this is :-
    C:\Program Files (x 86)\Bentley \MX V8i (SELECTSeries 3)"
  • However the 8.11.09 Quick Install  Guide (Last updated March 6, 2013) states at bullet point 3:

    "You cannot install and run Bentley MX on the same workstation as a previous version of Bentley MX . You 
    should always uninstall the previous version."
Which is it?
Can I install SS3 without uninstalling SS2? (this would be great)
Also, can models edited by SS3 be reopened in SS2?
Does the same apply to the MS v8i SS3 (08.11.09.459) and  dependencies?
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