There are several possible causes of the Not Installing Error in Call of Duty: Modern Warfare 3 (MW3 2023). There are a number of steps you can take to resolve the problems when Call of Duty: Modern Warfare 3 (MW3 2023) won’t install, the installation is stuck, or the data is corrupted and cannot be installed.
How to Fix the Not Installing Error in Call of Duty Modern Warfare 3 (MW3)
First, download and install the MW3 beta packs
I think Call of Duty HQ should cancel all other downloads and installations and prioritize the Modern Warfare 3 Packs first. Installing and downloading MW2 and Warzone might delay the installation of MW3.
Warzone and MW2 should be uninstalled
It may also be worthwhile to uninstall MW2 and Warzone if you already have them installed and see if that helps the installation process for MW3. We have found that this method has worked for us and the game is now working as intended.
Call of Duty HQ should be restarted
There is a call of duty HQ that contains all the games you need, including Modern Warfare 3, which is included in it. If you encounter any problems with Modern Warfare 3 or any of the games contained within, you can restart the game.
Restart the device
Alternatively, you may want to restart the device that runs Modern Warfare 3, since it might be the problem. By restarting the device, you will cause the system to reboot and the issue will be resolved.
Free Up Storage
There is a lot of storage space required for Modern Warfare 3, so that is why you should clean your hard drive before downloading the game. This is a common problem with games in general, so make sure to have enough space on your hard drive before installing the game.
Install Device Updates
Possibly, your device’s operating system is outdated, which is causing Modern Warfare 3 to slow down during installation. Try updating the system and installing the game again afterward.
Reinstall MW3 Beta Pack 01 and 02
Should none of the above methods work, you may want to try deleting and redownloading the MW3 Packs. This method has a better chance of working, but it may take you a bit longer to complete.
Reinstall Call of Duty HQ
You are most likely going to have to reinstall Call of Duty HQ, which has the largest file size on all platforms. To reinstall it, you will have to download around 50GB (depending on the platform). For those with a slower connection, doing it will take more time than others.