QTR-Quadtone RIP

I paid for an early version of QTR (back before it could be used to 
create custom profiles so it's been a long time ago). Back then I used 
it with my Epson 2200 which I've since sold. I've now downloaded the 
current version for use with my current printer, an Epson 3800. Am I 
expected to pay again since it's a later version and a different 
printer or does one payment cover all later versions and printers?  
Please understand, at $50 I consider QTR the best bargain in the 
history of computers so I don't mind paying again, I'd just like to 
know if that's expected or not.