[GNC] AlphaVantage

[Les]

Over the weekend, I upgraded Linux Mint from 18.2 to 19.1.  With the 
upgrade, GC upgraded from 2.6.17 to 2.6.21.

After updating prices, I no longer was obtaining any quotes for 
currencies.  If I remember correctly, currencies are being served by 
AlphaVantage.  I guess that the configuration of AlphaVantage did not 
follow the upgrade.

Questions:  Does GC 2.6.21 have a location in the Preferences or is that 
only for the 3.0 version?

If I need to configure AlphaVantage manually, can someone point me to 
the instructions for this?

Thanks,

Les