Hi guys
Here is how i've done it
Grab and run the earlier version (r7) and set the tileset to the one you choose (for me Spacefox) then launch DF from the launcher and load a fort, (If needed create a tiny world and launch at least a fort), quit by saving it. This is for DF been able to create the actual SAVE folder (if you have download the r7 version again there will be no save at all).
Now go to the r7 folder and copy/paste the "graphics" folder from "./r7_folder/Dwarf Fortress 0.40.24/raw" to "./r8_folder/Dwarf Fortress 0.40.24/raw"
Don't forget to do the same with the "graphics" folder from "./r7_folder/Dwarf Fortrss 0.40.24/data/save/region1/raw" to the one at the same location in the r8 folder
(Like Frightlever mention earlier, thx mate that was my problem
)Now as long as you don't touch graphic option from the launcher (I'm pretty sure it's gonna be fixed soon

) your tileset should work. It does with mine

Thx to PeridexisErrant, SpaceFox/LeoCean, Capt'n'Duck, Meph,... and all (there is simply too much) who work hard and free of charge for us and of course
thx to The Toady