It certainly looks like your download of the 'juicebox_pro_1.5.1.zip' file is incomplete/corrupt and you'll need to download it again.

Once you have downloaded the file, you can check its integrity with the following properties:
Filename: juicebox_pro_1.5.1.zip
Size: 1,909,296 bytes
MD5: 650ec4e216ff1130d66e96c5ba361b64
SHA1: 7ce66e3822c37fce0f83df1bccf28528feb318f0
SHA256: bbe2c14e0625979a050d40c56c7ce89a398a761cc37d741f810071cd589dcbab

You can check a file's hashes with a program such as HashCalc (free) or HashTab (free for personal use).

If you have trouble downloading the file and you have any download accelerators or managers installed (or browser extensions which handle downloads), then try temporarily disabling them before attempting the download.

Also, you could try downloading the file using a different browser (Chrome, Edge, Firefox, Safari, Opera).

If your downloaded file has properties which match those above but WinZip still gives you an error message, then try unzipping the file using a different program. Windows (since XP) and Mac OS X both natively support zip files so you should be able to extract the file without any third-party software but, if you are a Windows user (by the look of your screenshot), you might like to try 7-Zip (free).

(I have reactivated your download link so it should not expire whilst you attempt to download the file again.)

I hope this helps.
Please let me know how you get on and if you need any further assistance.
Thank you.