Hello Macken :)
Thank you a lot for your support :) !
I didn't create an unity package for each of my packs, sorry about that (I'm lazy). Moreover, some unity package (as for the Exterior pack) may not be up to date, indeed.
What you can do : don't use the unity package (which is just the asset_16x.png imported, sliced and put into a tile palette). You can import the atlas_16x.png yourself (it's up to date for each pack), if you are used to.
What I'll do : remove the unity package in each pack and provide a tutorial to import Super Retro World assets in unity.
In the near future : I want to build one big unity package and sell it on the unity asset store as well.
Sorry for this inconvenent, my friend.