Realistic, but not real market data is available from the demo version of Interactive Broker's Traders Workstation (TWS) platform.  For educational purposes the demo data is a good and free alternative to the sample data delivered with OptionScape.

TWS can be downloaded from
https://www.interactivebrokers.com/en/index.php?f=19903&invd=T

The User Guide for TWS is available at
https://www.interactivebrokers.com/en/software/tws/twsguide.htm

Once installed, TWS has to be configured to enable ActiveX and socket clients, and the socket port has to be set to 7496.  Please follow the TWS manual to do that.

After enabling ActiveX and socket clients in TWS please select Interactive Brokers in the Data Source menu as shown below.

Now OptionScape will be able to communicate with TWS, and extract option chains and risk parameters for your selected underlying instrument.