go to appdata folder
1. to get there press win + r or type run in on the search bar click to launch run
2. type in appdata press enter

now once you are in appdata click on in this order
1. local
2. Saltpeter
3. saved
4. savedgames
5. _0

once in _0 you will see a file called
AutoSave_Demo_0 or AutoSave_Demo_1
rename these to
AutoSave_0 or AutoSave_1

now luanch game and enjoy