I hope it is still in beta. I am definitely not putting it on a production machine. I haven't done it, but I don't know why it would be difficult to uninstall 6 and reinstall 5.
From reading everything, it sounds like it works with 5 or 6 and there are differing degrees of slowness.
If you want to make it work less efficiently, then reboot your "main computer."
If you are putting it on a "main computer" or "server" then buy an appropriate virtual machine and have an extra OS around. Sure, you will have $200 invested in each, but you can always use them. How helpful would it be to have a VM on the computer running Windows 7 and AC 5.029? Then just change over.
