Thanks for writing.
It is possible to install previous version of a product, if you don't have a newer minor update already installed on the machine (you can read more about minor and major updates here
). In other words, if your programmer have the Q1 2011 SP1 release, he/she won't be able to install the Q1 2011 release.
If you have clean machine, it's not problem to install Q1 2012, Q3 2011 and then Q2 2011 (in this order), because these are all major releases and they could be installed in parallel.
I hope this information is helpful. Let me know if the problem persists.
the Telerik team
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