2
Some mirrors (or connections to) may have problems while transferring the archive. This is then premature ended and the archive is not complete. Weird is that this is almost never detected by the unzip.
Retry the download, if necessary with another mirror. It should have a size of 527KB and contain 250 files and 1544 KB
You can also use the complete 2.4.4 archive as explained in the release notes. After uploading to the server, run once the file check (see release notes).