As part of CTP5 we will have a second download available which will be an updated MSDN library.  The updated MSDN library will include the DBPro content and enable F1 help in many areas of DBPro.  The updated MSDN library with CTP5 will only be available in English.
The updated MSDN setup will support:
•         Clean installations (no prior MSDN installation).
•         Upgrading from the VS 2005 RTM MSDN library.
•         Upgrading from the VSTF MSDN library.
•         Side by side installation if you have a different language of the MSDN library (e.g., you have the Japanese MSDN library installed).
Upgrading from the August MSDN library won’t have been tested by the time CTP5 is available.