Trying to install Melodyne

I logged into my Celemony account and downloaded Melodyne Essential 4.1.1.011 (Windows version). It took an age to download. When finally ready, I tried unsuccessfully to unzip the zipped file, either with Windows or 7-Zip. Assuming the file was corrupted, I downloaded it again. The second file was identical in size to the first one. It wouldn't unzip either so I copied it to another computer and unzipped it successfully this time using BitZipper. Seems pointless that they bothered to compress the file, as the zipped version was marginally larger than the original file itself. Anyway, back on the main computer the file would not run. It had no file extension, so I tried adding the extension ".exe", but this did not help either.

Any ideas? What can I try next?

Matron Landslide
...Here is a pic of the contents of my zip for comparison. (did you get a 'personalized' zip, like with your user name in the file name?)
 

 
Yes I did, but my zip file only contained one single file with no file extension and with the same name as the zipped file.

On a whim I tried renaming the file and adding the file extension ".zip". Then I ran BitZipper on it and it extracted a set of 15 files resembling Matron's screenshot above.

I didn't really expect that to work but it did. A zip of a zip seems pointless and an unidentified filetype makes it confusing. It certainly wasted a lot of time for me. I'll be busy today and won't get time to continue with this until Saturday now.

Celemony supplies the installer with a file extension. What the browser and OS do with the file is another matter. I recall a problem with some of the X Series installers being downloaded without extensions when using IE some years ago.