If you don't know what you are doing or you don't know Windguru at all, DO NOT INSTALL this app unless you enjoy the feeling of disappointment.
This app is just a reincarnation of the ancient 1.x version of the Windguru app for those who prefer it to the newer Windguru Lite which is also available from Google Play. This app is not maintained and WILL NOT be developed further, it's simply too difficult to maintain the old and outdated code…
MOST WINDGURU USERS WILL WANT THIS:
the original Windguru website is made as a Progressive Web App (PWA), which means it can work just like an app on your Android device and offers full functionality. It's recommended to use it like that. More info at https://www.windguru.cz/apps.php