Where are BitRay2 save games stored?
BitRay2 uses the registry to save certain information, including save games.
In HKEY_CURRENT_USER\SOFTWARE\DefaultCompany\BITRAY2 you can find a key named BITRAY2_LevelCount_h41656808. This stores the number of levels unlocked.
Copying the value from the computer which contains your latest progress to the computer where you want to reload your progress does the trick!