installing sw2011 PR1 along side sw2010

Hello all:

I would like to install PR1 along side 2010 SP4.0. I run the the SNL server. If I run the install from the server, it will update my SW install to 2011. I don't want to do that right now. If I install PR1 using the download file, I get an error message that states "could not obtain a license for SW STD. License server does not support this version of this feature (-25,147,0)"

I'm guessing since I used the network license code to install PR1 it is requesting a "stand alone" license from the network server. I did update the SNL to 2011.

I don't want to update to 2011 until I understand how it will run on my machine (which is a few years old). Is there a way to run 2 installs of SW, one production via the SNL and pre-release as a separate install?

Thanks in advance.

SolidworksAdministration