Installing the new free tools initially causes the errors above. Your solution fixes that but, the hotspot tool in the properties tab stops working.
Trying to uninstall free tools in the extension manager seems to work fine, but when you go to open DW and the uninstall window opens it just hangs and does nothing. You have to close it manually and once you do this a number of error windows show up. I'm afraid I dont have those errors to hand.
Install is fine and again, using your solution, the initial error messages go. Hotspot works absolutely fine but the uninstall of free tools basically has the same effect as in the CS6 version.
I have tested both on a desktop (Win7 Pro) and a laptop (also Win7 Pro)
Happy to help more if you need any further information ...