[Dx4win] Upgrade question

[Tony EA5BY]

Hi friends & HNY!
 
I need some help:
I have DX4WIN Ver. 6.03 (Jan. '05) and I would like to upgrade to the latest
version.
Should I use the same file to unlock it or do I need a new one?
I prefer to ask before I... 
 
I have sent an email to ON4AOI to upgrade my DX4WIN, but no luck.
I have sent an email to DX4WIN-USA, but no answer.
 
Any help is welcome.
 
Many thanks.
Tony EA5BY