1. Download V0.9
2. Extract it
3. Go to you V0.8 folder
4. Copy the file "Mushroom Kingdom Showdown V0.8 Save_Data"
5. Paste it into the V0.9 folder
6. Left click and rename
7. Change V0.8 to V0.9
8. Done!
Just thought it might help some people, because I know how the save data works.
PS: