I couldn't download any attachment from Gmail for the last couple of days. The problem might be with my ISP or my router's MTU who knows. So I tried to download the attachments embedded in the RAW email.
First I opened the RAW email from any mail's "Show Original" menu. Then a page with the attachments appeared encoded in base64 encoding. This page may be huge in size as all your attachments are embedded there. Save the page as email.txt
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Download mpack package using apt or rpm or pacman.
sudo apt-get -y install mpack
This is what I used on my Kubuntu system. Then I navigated to the directory I saved the email.txt file and fired up the munpack command.
minhaz@minhaz-desktop ~/download> munpack email.txt
Database.zip (application/zip)
www.zip (application/zip)
nginx.zip (application/zip)
minhaz@minhaz-desktop ~/download>
You will then find the attachments extracted to that directory.