I don't know because I don't have devices for testing, but in theory you could help to test some mac builds. If you have free time with this then you can contact me on Discord (@sokadev).
Make sure that you trigger every achievements in this update, even if you have already unlocked them in previous. If the error still exists, contact me on Discord (@sokadev)
The hint in the game is clear, you have to peek at the girls several times and stay unnoticed. Choose *PEEK* options and don't stay long, Rukia in the closet, Orhihime changing clothes, Rukia showering and Tatsuki.
What platform are you on? If on PC, the progress will NOT be deleted, if on Android, the progress will be deleted, unfortunately this is a bug, and to resume the progress then we advise via skip.
I think it's because I've made the h-scenes is global variables now. This means you should unlock them again and they will be unlocked permanent (even if you delete the saves). You should unlocking them again via skip.
Hmm, what do you mean by nothing, I checked and you should be thrown into a gallery with h-scenes open throug the game. This gallery can also be accessed from Sandbox Mode. Did you use old saves of the game?