Try reinstall the DB Master 11 beta 5. Unintstall with the any uninstaller program.
and the i repeat;
also you should need to install Microsoft C++ runtime redist library's 2005, 2008 and 2010 (x86&x64) versions.Try these.
What is your operating system?
How is you got error message on the installing Framework 3.5?
If you use the Windows 7 or Vista, right click on DB Master 11 shortcut and select "Run as administrator".
I think you should need to framework 3.5 and the install Windows updates...
Hmm, did you install the .NET Framework 3.5 and 4 versions?
Also you should need to install Microsoft C++ runtime redist library's 2008 and 2010 versions, finally install the Windows updates.
You can try these methods.