I have found two different versions of this file. One from the official site and one from here.
Does anybody know what the differences are? Is one newer?
r18.rpa (from 4leafstudios.itch.io) E0241ED5 (29,232,631 bytes)
r18.rpa (from www.katawa-shoujo.com) 0DB465A4 (29,049,537 bytes)