Since version 9 AE Financial is able to display Yahoo Finance data.
The feature addressed to those users who trade rare instrument unavailable in Metatrader 4.
Yahoo offers only end-of-day historical data, therefore no live mode or other time frames are available in this mode.

Does my AE Financial supports Yahoo Finance data?

Look at the program main window tool bar.
If you see financial data source selector drop-down list with Metatrader 4 and Yahoo Finance items, you version supports the feature.

If the control is grayed out and disabled, check AE Financial\FIN folder. It must contain at least one *.csv data file.

In this case you have to go to Yahoo Finance website, search for the instrument(s) you are interested in and download historical data into AE Financial\FIN folder