Error 1811 is a license verification issue.
Locus cannot connect to the requested service provider (Google Play).
This usually means that the application is not installed.
Are you sure you have the same Google Playt account you used to purchase Locus Pro?
Also, make sure you have a working Google Play app installed.
And a functional internet connection.
You are not in an area where your Google Play purchase cannot be verified?
You can also try clearing your cache data from the Google Play app on your device (Settings - Apps - Play Store - clear cache). Restart the device and try installing Locus Pro again.
The latest version of the application is 3.55.1
Have a nice day
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