Problems with downloading a batch file from Finalsite

A teacher was having trouble downloading her files from Finalsite, the zip file was turning into a cpgz file.   I have never seen this happen before!   When the .zip file is attempted to be unzipped, it extracts into a .cpgz file, which then can also be launched in Archive Utility, only to then turn back into a .zip file, which then turns into a .zip.cpgz file.   Ultimately, the archive gets stuck in an infinite loop as it’s being decompressed into one variation of the other, over and over again.  This could be that the download is corrupt, or it was not completely downloaded.  One suggestions is to use a different browser,  I will be curious to see if that resolves the issue.  Another suggestion is to use the command line tool.

• Launch Terminal, found in the /Applications/Utilities folder
• Find the .zip file in the Finder and have it easily accessible
• At the command line type “unzip ” followed by a space, then drag and drop the .cpgz or .zip file into the terminal window to automatically enter the full path to that file, then hit return

I am also curious as to whether or not this is a Finalsite issue as I know we had problems with Finalsite yesterday.