@Baku good effort, thank you!
I've updated my offline mirror too but I just realized I never posted the link to it anywhere oops:
https://drive.google.com/drive/folders/1y8YJ3dWrZdugFT1GXNOwKY_5nacA88io?usp=sha...
Everything completely uncompressed as-is. The "2020 only" (at ~180MB) mirror only contains this year's carts. Just open START_HERE.html with your Browser. I've modified the html a little here and there but only to remove the unnecessary JS (the lightbox, facebook and twitter buttons, google analytics).