I have Windows 8 and just bought Object Desktop this past Friday. I installed each app individually and did have some issues. The biggest problem is that Theme Manager crashed my system so badly that uninstall could not work, nor could control panel. Stardock Support has been trying to help me, but the results of a recent scan showed numerous files missing and too many errors that cannot be fixed. I am now resetting my computer back to factory standards and will be re-installing software, etc to get it back to where it was before I installed the Stardock apps.
Doing the research now (albeit a bit late, but not a mistake I will make again) it appears that Theme Manager is not intended for Windows 8 yet and still has some debugging that needs to be done. The Object Desktop sales screen does tell you which applications are ready for Windows 8, so I plan to only install those applications. Too bad they don't do a better job warning people about the "not quite ready" applications. It is still worth the price to get the package than to buy each individual application. After I get my computer back up to snuff, if I continue to have issues I will post another message.