New subtitle parser/renderer was introduced with version 2.41.1003.
Most recent changes in new subs-engine were done in version 2.50.1016
Most recent versions at this moment are 2.51.1022 resp. 2.52.1023
beta.
I don't know when your Pro-licence expires/expired, but you can easily find out by
logging into your user area.
You can always download upto the latest Pro version within your licence-period.
And most recent Free version can be downloaded by everybody of course.
By the way: if you're using Pro-version, why aren't you using BS.Player-Pro's in-built subtitle editor in stead of notepad?