End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in one of spicepress.zip or
spicepress.zip.zip, and cannot find spicepress.zip.ZIP, period.
I think , Either the .zip file is corrupt, didn’t upload properly, or you don’t have sufficient space on your server to hold hold and unzip it.
Try unzipping locally then uploading the resulting directory to wp-content/themes on your server using FTP Utility.
More help read help docs link.
Feel free for further assistance.