Understanding exactly how upgrade works

Hello guys,



I'm new here. I'd rather send this message to avid via support but I couldn't find a way to do this.



I don't know why (maybe because English is not my first language) but lots of points are not clear to me.



I own a PT 10/11 license (not HD) and I'd like to upgrade to PT 12.



Here are my questions:



1-) If I commit to the annual upgrade plan ($ 199) my existing PT 10/11 licenses will stop working? What if after that one year I don't pay again? Will PT 10/11 stop working for me?



2-) If I commit to the annual upgrade plan ($ 199), I'll be able to use PT 12 only as long as I pay the annual plan? What if after one year I don't pay again?



I'm asking this because, either I commit to this plan or I buy a new license just not to run the risk of my software stop working.



Can anybody help me?



Regards,