
Installing is not as straightforward as flipping a switch, but it is far from impossible. The key takeaways are:
This is unusual, as the "Arabic Edition" disc has the language files pre-loaded. First, ensure your console's system language is set correctly. Go to Settings > Language > System Language and set it to Arabic. You can also try launching the game and manually selecting Arabic from the in-game Options/Language menu. If the issue persists, try rebuilding your PS4's database. To do this, turn off your PS4 completely, then press and hold the power button until you hear two beeps (this boots the console in Safe Mode). Connect a controller via USB and select option 5, "Rebuild Database."
If you have the correct regional version, follow these steps to ensure it is active: How To Change Language in Witcher 3
The Arabic pack does not include voice acting. Geralt and NPCs will speak their default language (English/Polish/Russian depending on your disc region). The audio language is separate. To fix weird audio mixing: