All of your questions can be answered in the first post of every single thread started for ASSARV9 ASSARV10 and ASSARV11.
The major difference is the functionality between the three. I will note this here for you:
ASSARV9 is a trend scalper. It trades in the direction of any major movement in the forex market in that moment.
ASSARV10 is a counter trend scalper with news filter, hidden stop losses, hidden take profits, hidden trailing stop settings.
ASSARV11 is a counter trend scalper with more functionality from the EA settings. From there you can choose to modify the volatility settings as well as trailing types, etc.. You have lots of internal functions displayed within the settings. However, assarv11 does not have hidden orders or hidden trailing
Hope that helps,