Can I have SyncBack, SyncBackSE, and SyncBackPro installed at the same time on the same computer?
Yes. Note that when you first run SyncBackSE it will automatically import all the profiles and settings from SyncBackFree. When you first run SyncBackPro it will automatically import all the profiles and settings from SyncBackSE. To import your profiles into SyncBackPro from SyncBackFree you can select Profiles->Import profiles from SyncBackFree from the main menu.
Important: Do not install SyncBackFree into the same folder as SyncBackSE or SyncBackPro. SyncBackFree modifies profiles to remove features that are not supported. This won't be a problem unless you are running SyncBackFree from the same folder as SyncBackSE or SyncBackPro.