Replying to Help! Transferring From Google Photos to Computer

I have 6 years worth of photos to backup before the year ends. It’s somewhere between 20,000 - 30,000 photos. After the new year google photos is deleting everything.

There has to be a simple solution to this. Is there no way to download everything at once over a day or two?

I can only select 500 photos at a time to download to zip files and it’s a fucking mess so far. Zip files missing photos, videos breaking down into multiple files, crashing, files not copying and just general fucking bullshit.