That's the same one I have I believe, You can do one or both of these apps, the one we are on now (which you''ll need to start uploading to weatherrunderground.com (costs nothing) to get api key.
This depends if your friend received that api from weather underground within about the last month then no, you should be ok....if it was provided to him before they eventually shut down their free api's then yes you will need a new one, and that is only provided if the weather station is uploading to them (for free) OR they charge you for the API key.
OR you can install this app and driver Ambient Weather Device which you will need to go into your Ambient Weather Dashboard and generate a application key and api key to insert into the app once installed.
I use both to get all the data I prefer each dashboard tile states which device the data comes from...see attached screenshot.
