Unfortunately, it’s fairly common and can happen not just with EE updates but any plugin/theme or WP core.
It’s difficult to troubleshoot because it can happen on update attempt 1 and then you can revert the site back to an exact copy from before that update and it’ll work as expected on update 2.
EE is larger than most plugins and has more files than most, so your more likely to see the error with EE but the cause is something within the update process and EE doesn’t actually do anything during the update other than providing the URL to download the zip.
Either way, I’m glad the above fixed it for you and if you have any further issues just let us know.
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