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Thanks for explaining!There's some comments in the thread that explain it, but:
I don't have a proper download button (yet) so any images you want you'll have to right click on and save. Some people have issues with this, so try right clicking, opening image in new tab/window and then try saving from there.
and yes they are free to use, commercially and noncommercially.
Also not all of these are tilesets, some of them are incomplete so you may need to do some mild editing to add them into a tileset