How to download large quantities from gmail

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Hi, Have been using gmail for years. Thinking it is probably time to download and backup. Unfortunately this is probably 10thousand? Or more emails, not sure but maybe 10gb or maybe more.
Will be downloading to a Windows desktop.
Is there any method or email client you would recommend? I would like to keep the originals on gmail as they are. I saw this on google support, wonder if anyone can comment on the app recommended here—
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Quoted from google support
Hello,

There…

How to download large quantities from gmail

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