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Those errors indicate you’re getting improper file permissions on the mentioned paths.
Try accessing those paths with your FTP/sFTP client progream, and change their permissions to 755 or 777.
I can confirm it is not an issue with the theme.
Adding, the related documentation about this can be read on here.
Great - that worked!
After the update, which are the files and directories that I can roll back to permission 755?
You can find out information about this on Permission Scheme for WordPress.