The version you referenced typically unlocks premium capabilities that are restricted in the free tier:
: You can choose specific apps or websites to bypass the VPN (split tunneling) while keeping others protected.
: Grants access to a full list of high-speed servers across the Americas, Europe, and Asia.
Since manual APK installation is required for versions not directly from the Play Store, follow these steps: AdGuard VPN — private proxy - Apps on Google Play
: Removes the monthly 3 GB cap found in the free version, allowing for unrestricted streaming and downloading.