Hello Aashif Bashir dar,
I really agree with you that damian clearly said the optisytem is backward compatible but NOT forward compatible, but there should be some way for licensed users because we are also suffering as the previous dongle is not detected by OptiSystem 14, and upgrading a license is not an easy task for us, we have to request the respective authority of our and follow some steps it takes lots of time and it is really a tough job buying for maintenance. It is better to for design from starting.
Regards,
Dhiman