The save data for Oh So Hero! will be in a different location for each operating system.
At your Desktop, press Windows+R on your keyboard to open the Run window.
Next, copy and paste the following line into the Open textbox and click OK:
%USERPROFILE%\AppData\LocalLow\Full Frontal Frog\Oh So Hero!
An Explorer window will appear to show you the contents. The pertinent files are:
Additionally, Player Prefs are stored in the Registry:
Computer\HKEY_CURRENT_USER\SOFTWARE\Full Frontal Frog\Oh So Hero!
Navigate to the following location:
~/Library/Application Support/Full Frontal Frog/Oh So Hero!
You'll find GalleryData.es3 and SaveFile01.es3 here.
When playing a new version of the game, your save data will be carried over automatically. This is because it is stored in your user directory and not the program directory. However, data from a version older than 0.15 (Pre Edition II) will not be compatible with newer builds of the game.