Email Client help

I’ve been using Thunderbird for years to have an offline storage of my Gmail emails. Thunderbird has been playing up and freezing a lot lately so I’m trying to replace it. For some reason there doesn’t appear to be an easy way to get one to download fully all emails from last 2 months only, whether they’ve been downloaded previously or not.

I would then want to just download all emails that come in from that point onwards, with a check every x miuntes setting and a manual check now.