So, we have 3 versions of the demo (full version and two edited versions):
#1 2:40 from Ridding High OST
#2 2:58 version with "One, Two" at the beginning, more guitar before Mark stars singing and longer chorus fade out ending.
#3 3:36 full version with guitar solo at the end.
#1 and #2 are mono sound, #3 STEREO (thanks dr)