Why am I seeing this?


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Your computer is telling you that in order to do that particular update, you’ll need to free up space. In other words, your internal hard drive is full. I’m guessing you’re trying to move to the latest OS “Big Sur”. Big Sur is 12 gigs large and you only have 16 gigs available. So you would need to find items that you no longer need in order to free up space. It’s possible we may be able to remove iTunes movies or TV shows, old iPhone backups, etc… that could be taking up space you no longer need.