>Can anyone confirm my understanding of how to conduct version upgrades in an n-tier system? If changes are made in middle-tier but no old Interfaces are broken and with Binary Compatibility set, compiled a new version with the same name, how do I deploy this?
>
>1. Just copy new file over the old.
>2. Unregister old DLL, delete it, copy new DLL, register.
>3. Must run SETUP.EXE after "Package and Deployment Wizard".
>
>If I break the old interface, I'll have to redistribute the client EXE and the DLL again?


If you want to unregister a component, you need to do it before you copy your newer version over it.

If you break compatibility, you need to redistribute the client application if you use early binding because class ID are in compiled into the EXE.