That one is a bit harder to find, I'll grant you. "Early save" is not a common thing to search for.
Sounds like files could be corrupt or missing. Try redownloading the game and extract it to a different path, then move your save over.
Nope. Tried downloading the no-RTP version and it's the same. I think the problem is that the event that should autostart when you enter the dining room doesn't start for some reason, and that messes up the whole thing, because it doesn't give me any error and the game technically still runs.
From what I remember you need to buy all the normal clothes, all the sexy clothes from the store near where you live, its upstairs in that store not downstairs as you would think, then talk to hmm angie is it in the teachers lounge about clothes, she should the make a date to go clothes shopping with you the option to buy the revealing suit then comes up in the same place you bought all the other clothes I think.
Yep. Did you manipulate states to get there or something? There's a switch in debug you can flip to get out, but you'd have to search the thread for it. I recommend just loading a save.
The Science Club questline? It starts from the Computer Club questline. The Computer Club is next to the Staff Room. You just keep going back to the Science Club's lab once the questline starts. If you mean what you need for the Good End, then Serena needs to remain sane through the mindbreaking scene. I used the relevant amulet myself (see the Desire Shop for amulets), but have been told that no longer works, so you probably need maximum sanity and perhaps a sufficient succubus level/powers. Standard RPG stuff!
This post apparently has the changelog: https://f95zone.to/threads/succulence-v2-5-ae-r-nest.6339/post-4483002. I'll report this post to update the changelogs in the OP.
There is an empty class room (after class) with a locker where you can change clothes.
