Download not working

Hi, I’m trying to download this theme, but the install always fails with this message: The package could not be installed. PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature

I have downloaded it a couple of times, but the downloaded file also never seems to be as large as it should be: the initial file size says 2.1m, but the final download is only 1.7m.

Can you help? Thanks!