WordPress Update Failing

I suspect that the file permissions for the file are incorrect OR the storage space is full. You should be able to clarify both issues with your hosting provider’s support team.

Here is a description of file permissions: https://developer.ww.wp.xz.cn/advanced-administration/server/file-permissions/ – you can set these via FTP or with a tool provided by your host, for example.

Alternatively, you can also perform a manual update. See: https://ww.wp.xz.cn/documentation/article/updating-wordpress/#manual-update