The PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature error is usually displayed by WordPress as a result of one of three things: There's an issue with the zip file you're uploading WordPress doesn't have enough memory on the web server to unzip and upload the contents of the zip file or even your hosting Server Disk Space Issue(To confirm this, try to upload other files to your sites, such as an image, video or other Plugin. If you're not able to upload large files, then storage space is likely the issue). An error being thrown by a plugin or script on your site We can exclude out No.1 and No.3. You might want to try to install the zip manually, then it may mean that there's not enough storage space on your host for WordPress to be able to unzip and upload the contents of the file. We suggest talking to your hosting support to see what they can do about the space that needed to unzip.