About Yarizo relationship events read
HERE
About rvdata save files read
HERE
About save folder locations read
HERE
About the most basic difference between the Vx Ace 0.50a and MV versions read
HERE
Only if you want to play the story:
About where to get NymPri Vx Ace 0.50a read
HERE
These are really old, ancient, redundant versions of the game. They were the "Revision" versions, that's why there is an "R" letter in front of the numbers. If I recall correctly, they were meant to show the process of patching the game at the time.
Nope. You can't progress Yarizo relationship that much without cheating or editing your saves.
Edit: Please, learn to be more specific about the problems you encounter. And most importantly, please, learn to edit your posts ffs. This is the absolute minimum you could at least learn to do.