The PCLZIP_ERR_BAD_FORMAT (-10): Unable to find End of Central Dir Record Signature error occurs during the theme installation or update process.
There are two possible reasons for the error explained below:
1. Corrupted or incorrect .zip folder of the theme.
The issue could be due to a corrupted or incorrect file format. Kindly re-download the theme from the Envato account and repeat the installation process to resolve the issue.
2. Insufficient webspace.
If you encountered the issue while updating the existing theme, then it may be due to insufficient storage space on your host for WordPress to unzip and upload the contents of the file. To confirm this, try to upload other files to your sites, such as an image, video, or other plugins. If you’re not able to upload large files, then storage space is likely the issue.
You can either remove some files (backups or themes & plugins that you’re not using) or contact your web host to increase your storage capacity.