It's been a while since I've downloaded the game (ver 16.2) and now it's at ver 20.4 . Is there major content update at 20.4 or can I still continue playing ver 16.2?

if there is, how do I actually move my save files from 16.2 to 20.4?

Thanks in advance

There's no need to move files! It automatically searches your computer for any kind of save file linking to the application, example, if you were playing on v 13, and decide to play on v 16, if you load a save file, the files from v 13 are shown there.

20.4 is actually the last update for the original lust doll. If you want to transfer saves, I believe you have to move them over from the older version.

I'm now working on lust doll plus, and for that, save files are stored in applocale, so it's automatically transfers between releases!