Download the AdGuard VPN APK file. If your browser displays a warning, allow downloading adguard-vpn.apk. Tap Open.
If installations from your browser are not allowed, you’ll get a notification. In this notification, tap Settings → Allow from this source.
In the installation dialog, tap Install.
Wait for the installation to complete and tap Done.
AdGuard VPN is now installed on your device. To launch the app, tap its icon in the list of installed apps.