Hello, Smalameri,
Thank you for contacting us and for using XStore.
Our documentation will help you – https://www.8theme.com/documentation/documentation/troubleshooting/troubleshooting-pclziperrbadformat-10-during-theme-core-plugin-update/
If you have any additional questions or concerns, please do not hesitate to reach out to us. Our support team is always available to assist you.
Kind Regards,
8theme team