There will be no compatibility problems between Cloud9 and FSDT products.
However, the installer for KDCA hasn't been updated yet so, it *might* be better to install the Stand-alone Addon Manager AFTER you ran the Cloud9 installer. It's available here:http://www.fsdreamteam.com/download/setup_addonmanager.exe
When we'll have an updated installer for KDCA, that step will no longer be necessary. Basically, after we update all installer, you shouldn't worry about the order of installation anymore. If, instead, you are using a Cloud9 installer, it's best if you install anything from FSDT *after* Cloud9.