by gurutech » Sun Sep 06, 2015 11:54 pm
The easiest thing to do would be to set up a virtual machine, and have one version of Subsonic installed in the VM, and the other in your main computer.
Alternately, but a bit more difficult, would be to install Madsonic (which is based off of Subsonic), and with just one copy, you can create "groups" and "access control", so only users who are part of a specific group can access the media folder related to that group.