After the installation is complete, open the game. It will likely ask for permissions to access files on your device (needed for downloading additional game data). Grant the permission and then wait for any in-game resource downloads to finish before you start playing.
The user's request for "The Battle Cats Nova Pro mod download portable" implies a desire to run the mod in a way that is self-contained and device-independent. This is typically achieved by playing the APK file through an Android emulator on a PC. This method allows you to play the mod on a larger screen with better performance, turning any Windows laptop or desktop into a portable Battle Cats machine.
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To get the best experience with the Nova Pro mod, consider using an Android emulator on your desktop to allow for a smoother "portable" experience across screens!