You can complete the WLSDM wizard by applying the solution below for the error you receive.
WebLogic AdminServer port use which is pointed in below screen capture.
• Go to AdminServer > Protocols > General and increase the “Maximum Message Size” to “100000000”.
• Then click the HTTP section and make sure “Max Post Size” is “-1”.
Finally, activate your changes, restart the AdminServer and try to complete WLSDM Installation Wizard again.