@aheyfromhome hits the nail on the head. Actual download c 33GB. Increase in hard disk space following installation is an extra 16GB or so. Some of the 33 GB replaces previously downloaded content as patches.
Even during this download cycle for SU7 I noticed some of the new handcrafted airports (e.g. Zurich) were a 5gb+ download that translated to less than 1.5 gb when installed!