Odd. Try showing incompatible saves on your load game menu?
Addon's are in the same folder as the base install, are you using the steam version or the version off the website?
Saves aren't stored there, there's no way you could've accidentaly wiped them. They should still be there. Go check in C:/Users/yourusernamehere/t-engine/4.0/tome/saves/yourcharactersnamehere
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