If the game crashes immediately upon clicking "Load," your save file may be truncated or corrupted. A 0KB file is definitely corrupted.
If you load a save and see a "Missing Asset" error or a black screen, the save is likely incompatible with the new version.
The first step in managing your data is finding where the engine actually stores it. Unlike modern AAA games that use "Cloud Saves," XStoryPlayer typically stores data locally.