It works offline and reads and chart offline for both EOD and Intraday data. You can't use it online unless you have a data subscription with Zenith. Version 19 is good only for charting. As mentioned Chullankallan, the System Tester and Explorer function will crash the program if selected.
Without these 2 functions, the Version 19 is not useful. If you check the Metastock release log, they even removed mention of version 19. Their release version is 18 then 20. No mention of 19 anymore.