In this case, you will need to clear the software update catalog first before attempting to install the pending update once again. Corrupted Software Update Catalog – MacOS Catalina and older versions might suffer from a glitch that affects the Software Update Catalog and ‘convinces’ your system that it doesn’t actually need the pending update.In this case, you’ll need to start by cleaning the caches folder before retrying the update. Corrupted OS-related temporary files – Corrupted remnants from a previous attempt at installing the system OS version might interfere with any new attempts at making the leap to Big Sur.If this scenario is applicable, you should be able to fix the issue by removing the problematic iTunes entry from the hosts file manually. Corrupted iTunes entry in the /hosts file – As it turns out, there are certain situations where your /etc/hosts file might become unusable due to a corrupted iTunes entry and interfere with the installation of a pending system update.Several users dealing with the same problem have reported that they finally managed to get the issue fixed after resetting both of these caches. An issue with PRAM or NVRAM caches – Another scenario that might prevent your system from installing a pending system update is an issue with the NVRAM or PRAM caches.To avoid this particular issue, you’ll need to uninstall kernel extension software like Parallels, CPU Gadget, or Little Snitch before attempting to install the pending update once again. A Conflict caused by 3rd party kernel extension software – According to a lot of affected users, there are several 3rd party tools that might cause this error due to the fact that they interact with the kernel. If the problem is related to an IP or TCP data inconsistency, you should be able to get the issue resolved by restarting or resetting your router.
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