I read through as much of that thread as I could manage (the page count just kept increasing...

), and, while Freddie did post a note about modifying his
custom_avatar table to work with Kier's Avatars-as-Files hack, this is not what my hack does.
My hack lists the custom avatars from Freddie's hack for 1.1.3 so that you can save individual ones for your users to use with 2.0.x. Since the 2.0.x upgrade leaves Freddie's
custom_avatar table alone, you can do this at any time after the upgrade (such as when one of your users notices that his/her avatar has disappeared and cannot remember from whence it came in the first place).
I realize that a really nice Admin might port over his/her users' avatars for them, but that does not describe me.