BuddyPress.org

I wanted to test ultimate member so I deactivated BuddyPress and deleted the related pages. That was a mistake. The Ultimate member has issues I don’t want to deal with and it scares me that some basic things like deactivating registration are not there. So, my questions is how do I reinstall or get by buddypress pages like members page, log in and log out. I notice the logout is missing in the menu options.