Alright, when software downloads fail due to internet, I always check my wifi. Even though my internet connection is not bad.
And I tried to download it with safe boot mode...
Restart/Turn Off your computer and hold the 'shift key' (hold it until the apple logo disappears) to boot into 'safe mode' and then start the update/download from there.
Worked wonders for me with startup security to none...
I'm now on Big Sur 11.2.3 🥰
Adytio
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Jakarta, Indonesia