We have updated the SetupBuilder 5.6 Runtimes. The PreRequisites feature in
SetupBuilder 5.6 Developer Edition supports the .NET Framework 3.0 (Final)

In the Redistributable Manager, please remove the .NET Framework 3.0
(pre-release) runtime from the Installed Runtime Package(s) list before
installing the final .NET Framework 3.0.

Friedrich Linder
CEO, Lindersoft

"point. click. ship" - that's SetupBuilder