While you have the game open click on the save game button and then you have the option to load or save on disk. Click load from disk and point it to the location where you downloaded my save and select it, click ok. That's all
When you finish class, at 17:00 i think, go to another classroom (if i recall not class 1) and you will see her cleaning and can have sex with her, when you finish (or almost) you see an option that says that someone is peeking at you
In terms of resolution/quality, I don' think so. The dev of this game didn't have two separate sets of images and videos of varying qualities for both versions. But yes, some other games may have done that, usually for online versions, to combat long image/video loading time for those with low internet speed.
