Hey Try,
Sorry to hear about the save issue. Its completely understandable to feel discouraged.
There will be two locations for your saves. One in the game folder (AHITR/Game/Saves) and (AppData\Roaming\RenPy\AHouseintheRift) (The Renpy folder acts as a sort of sync) - You could try seeing which save location is corrupted by maybe moving the saves to a temp folder, loading the game and trying the older folder etc.
If it is still corrupted, I do have a save that has everything up to 0.7.4 completed. I know its not ideal but it would get the ball rolling for you again.
Lemme know if the first method works!