alright, I'm not sure how this works, but I found an update as well as a normal base game install for the usa version of woolly world:
View attachment 309780
as you can see, the update says 00 00, which might be how the system knows that an update exists as only the base game's version number is changed. I think as long as that's present, the system will try to get you to update the game. it might be dangerous to remove it, so I would just leave it, change your version in the 00050000 to 00 20, which is version 32 (what I'm on), then try to update through usb helper or something. I see no indication that a version 64 exists.