BlueSoleil 8 and 6 do have the same license strategy. If you dongle can work well with BS6, it will work the same way in BS8. BS8 is BS6+ BT3.0 function. Please send email to sales@bluesoleil.com and they may give you tools to trace some log this will help to solve you problem.
And about the issue of SN。 Please make sure your system time is correct. you can aslo ask for help from sales@bluesoleil.com. If it still can not work, you can ask for refund,