Why do i get a decompression failed notice for downloading zip files

I'm trying to download my marks for my class and they were posted in a .zip file. however in the downloads box it's telling me that 'decompression failed' and when I try opening it it cannot be opened because it 'is still being downloaded'. I used to be able to open the files, but I don't know what I did.
I'm new to macs, so it's challenging for me to figure out what the exact problem is, and then to find the solution.
Thanks for your time!

Greetings,
This may be an issue with the specific Zip file you are trying to open (in which case contact your teacher to have them emailed to you separately).
Make your own Zip file by clicking on any document (like a picture) on the desktop and then go to File > Compress.  Try opening the resulting Zip file and see if it works.  If it works then whatever is going on is with that particular Zip file.  Make sure you are giving the file long enough to download.

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