I try to learn aspen Hysys and aspen Plus but I can't find good books or tutorials that teach how to use these software with explanation. most of video found on youtube just show where to click... etc but not why they do so .
it seems that the best place to go is aspen tech website itself but membership is needed to watch videos.
if anyone has a collection of learning material for aspen tech please share, I would be very grateful.
(sorry for my english)

Thanksss
Boyp