@fishinforfacts, sorry for not responding sooner, the API key is a Key that you get from Weather Underground for your Personal Weather Station (PWA), it's one of the options available to you when you register your PWS with WU.
Ok, I've included my procedure for adding weather overlay on to my BI Camera's.. The procedure once setup is pretty simple but if you haven't done this before, I hope my procedures help you.
How to insert Weather Data into BI Camera overlays
Note: I use the “ ” double quotes within this...
Alcon, I've been following this forum topic for a few years with no real resolve, it appears that the owner of BI Tools has abandoned his app. I've seen no real update/improvement of a great tools for BI in particular Weather Overlay handling.
I too was able to get my BI Tool to work again...
Dumb question is this app no longer be supported? if not why not I would have expected there are fair number of users out there, it needs some UI update and selectable Weather options JMTC