A key in Dov's comment is the upgrade issue (not sure about plugins, but they would not be in the proper folder in any case and would probably have to be reinstalled). If you are not using an upgrade, then I think you should be offered the option to ignore the uninstall and keep the old one. However, don't expect the old version to run seamlessly. One reason many folks like to keep the old version around is that they created forms in Designer and DC does not support Designer which is now a separate product. As Dov indicates, the old version may continue to operate is some manner if left on the system, but expect problems with that version. If you did an upgrade, don't expect the old version to be left since the idea of an upgrade is to replace the old version.
... View more