I never heard about Real time Data Update, how qlikview knows when there is a change of data in source?
I am not sure about Real Time Data Update, but in QV 11.2 there is a concept called Direct Discovery, which fetches the data from source when the data is required for report. So that you always have the latest data for your report.
But in this there is a disadvantage it always hits the database for data, this may lead to performance issues.
I haven't had a chance to work on this yet, but yes like Johannes suggested, you can look up to the forums for some help or you can probably try waiting until Direct Discovery is released as Jagan advises.
For a starter, these posts might help you. There is also an example document i found on the community.