About PCLZIP_ERR_BAD_FORMAT (-10), try the solution from this topic – https://www.8theme.com/topic/the-package-could-not-be-installed-pclzip_err_bad_format-10-unable-to-find-2/#post-273465
or do the update via FTP – https://xstore.helpscoutdocs.com/article/63-theme-update http://xstore.helpscoutdocs.com/article/37-plugins-update
Do not forget to create a full backup before the update.
If you need our help with the update, provide temporary wp-admin and FTP access. Also, confirm that backup is created.