Hey LarissaInAction, thanks for reaching out, welcome to forums and sorry to hear about the issue you ran into.
Your save file location should be in the following destination:
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\savegames\<Unique ID>\1803
One thing you can try is backing your save files up and then renaming them to 2.save or 1.save (does not really matter that much of what the name of the save is) and then launch the game, to see if it works.
If for any reason your save file got deleted or you didn't save your progress, I am afraid our team would not be able to restore it for you.
Should you have any further questions, let us know!