Use APKPure App
Get Windguru Old old version APK for Android
(very) old version of app to access forecasts from windguru.cz
WARNING!
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.
IF YOU ARE LOOKING FOR WINDGURU APP THEN THE INFO YOU NEED IS HERE:
>>> https://www.windguru.cz/apps.php <<<
.. 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 the best way to use Windguru on mobile.
This "Windguru Old" app is not maintained for years and WILL NOT be developed further.