Hmm, are you sure you have the fifth level of liberation (not the girl's level, but your own)?
If so, you may need to reinstall and delete your saves
You can delete your saves here:
C:\Users\Username\AppData\LocalLow\HornyUnionHQ\HornyUnion
The AppData folder may be hidden, so you will need to click on Show hidden files.
Save file names:
Player.log, Player-prev.log, and horny_union_current_0
You can move the save files to another location for now, but you'll probably have to play the game again :(