Are the 18+ scenes necessary for the plot, at all?

is it fully voiced? (Japanese)

Hopefully "someone" will made a patch for the removed content, otherwise i will buy the game on another store Im still hyped and hopefully this means, we will see the sequel/fansdisks too in the future

I already bought the JAST USA patch however it won't let me install it or maybe I don't understand how to do it, could someone explain to me

I've been searching around and have seen every other person talking about it, but haven't found ♥♥♥♥-all for where EXACTLY I'm supposed to download it.