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saves are actually in your appdata folder

C:\Users\YourProfile\AppData\Roaming\RenPy\Harem Hotel-numbers

Since its not in the game folder itself, you can just delete it in its entirety and download the new one, and they will automatically be there. No extra steps

I think it comes out today. The patreon lovers tier gets it 12 days early (pre-release 1) and the supporter tier gets it 7 days early (pre-release 2), and both of those were 12 and 7 days before the 25th... that or its all one big coincidence

you don't get foot fetish until after the competition. You should be fine, I only had a handful of stuff unlocked for her and I passed it. If you are still worried, just save right before and load that one if you fail. 

I think its like California

via the incest cheatcode that can be found on F95zone...

I thought all it did was change the relationship between Felicity and Emma to "twin" instead of "clone" at first, and so I didn't use it until I replayed the game to freshen up on the story, and found that it unlocked the new scene as well.