Hey so uh. I kinda accidentally overrode the save data folder location. To make it easier to upgrade and downgrade, though, I'll be keeping the new location consistent. That said, depending on which of these you're running...
Windows:
%APPDATA\RenPy\ "SihaiDatingSim[FREE/INTERN]-1561917752"
Macintosh:
$HOME/Library/RenPy/"SihaiDatingSim[FREE/INTERN]-1561917752"
Linux:
$HOME/.renpy/"SihaiDatingSim[FREE/INTERN]-1561917752"
Find that folder and move its contents into the
"SihaiDatingSimR-1561917752" folder
If you do that, you should have your saves from the last version intact.
I apologize for the inconvenience, this sort of thing won't happen again :x