Comment by dormento

Created this account just to help you :)

I was in the same situation last week - I needed an old file that was inside a .rar archive, and gmail wouldn't let me download it. I knew about google takeout, but i didn't wat to download several gigs just for that one file, so this is what i ended up doing:

1) In Gmail, create a label (any name will do, like "rar export");

2) Add the message google won't let you download attachments from to this label;

3) Go to google.com/settings/takeout, and look for the option which lets you export a single label from Gmail.

Hope it helps :)