“Removed the Views Popout Menu in the lower left corner. X-Plane has supported customized views via keystrokes for some time making this feature unnecessary and redundant.”
Through X-Plane's payload and fuel window.
If you're using their FMS Data Manager you need to add the addon with a User Defined Folder that points to the IXEG 737 Classic Plus directory under Aircraft.
I don't know. But taking a guess. Does it not appear on your orders history page? https://www.x-aviation.com/catalog/account_history.php
If not, best to get in touch with support@x-aviation.com
It was just r3 going from “beta” to “release”, nothing actually changed other than who would download it.
https://www.x-plane.com/kb/x-plane-12-00-release-notes/