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I'm attempting to upgrade from 7.x-1.9 to 7.x-2.2 using the traditional method (deselect the module on the modules listing page, delete the old files, upload the new files, refresh and reselect the module on the module listing page, run update.php).
However I'm encountering a problem at the first hurdle - the check box on the modules listing page is greyed out and followed by this message - "Required by: Drupal (Field type(s) in use - see Field list)".
I tried to skip this step and delete the old files, upload the new, refresh, reselect and run update.php and it worked, except the metatag fields on the content editing pages disappeared, as did the metatags in the HTML headers.
Obviously something is going wrong. Can you please describe the best process for upgrading so the fields and tags are preserved.