That should take you here https://www.google.com/settings/takeout
At this point you can select what data from which products you’d like to download. If you are just looking for a specific folder in gmail, make sure all relevant mail has been given that label, and then in the download data page, click Select None and then click Gmail and the drop down tab for more options:
At this point a pop up asking you to check off which relevant folders you’d like to download. Keep in mind that inbox, archive, and other large folders are checked on a column on the left by default and will need to be unchecked.
At this point, you just need to scroll down and hit “Next” and we’re almost there. Just choose the compression format (zip widely performs well, ie. for windows, mac, linux) and then select whether to receive an email (send download link via email) or add it to google drive.
Hit Create Archive and you’re done!.
For more information on downloading, reading, and opening specific types of data from different google products you can read more here
For shortcut links to manage settings for different google products you use, you can go to your Google Dashboard