Does the OWB package do the first step of wirting the two separate install packages (OWB and Scehdule Connect) to the specified folder on the disc?
If it does you could try to run them separately.
They create .msis file for the actual installation some where in Windows folder.
You can search for them when the installer is waiting for approval of the path and the selection of the components.
If you find them you could try running them.
If you do not have them you could start the install on any othe PC and take the .msi files from there and try to install from them.