SPD Server 3.x tables are not compatible with SPD Server 4.5.
If you want to use your SPD Server 3.x tables with SPD Server 4.5, you must first convert your SPD Server
3.x tables.For more information
about converting SPD Server 3.x tables for use with SPD Server 4.5, see SPD Server 3.x to SPD Server 4.5 Conversion Utility.
Upgrading SPD Server 4.x to SPD Server 4.5
SPD Server 4.x tables are compatible with SPD Server 4.5.
No conversion is required to use SPD Server 4.x tables with SPD Server 4.5. You can start SPD
Server 4.5 using domains that include tables that were created by
any SPD Server 4.x host.
Upgrading or Reinstalling SPD Server 4.5
If you need to reinstall
SPD Server 4.5 or you need to install a newer release of SPD Server
4.5, the install process does not alter any files that have been modified
in the \site directory. Any custom
modifications that were made to installation files are retained when
you upgrade SPD Server to a subsequent release.