Microchip has purchased Hi-Tech and is slowly, but steadily combining features of both companies compilers and phasing out Hi-Tech Compilers as they release major revisions.
Only the Hi-Tech C Compilers for the PIC18 and PIC10/PIC12/PIC16 families are still being offered.
You can download both remaining Hi-Tech C Compilers for free, the only restriction is reduced optimization:
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Actually, there is a third Hi-Tech C Compiler still being offered, the Enterprise Edition, of course the license is $3800. I believe Microchip is keep it around to appease current license holders. Although pricey, it not a bad deal if you develop with all the PIC families, eventually it will probably be known as Microchip C Compiler, Enterprise Edition.
As a user of the Hi-Tech line for many years, I'm sorry to see it go, I just hope Microchip incorporates many of Hi-Tech's features into new releases of their compilers.
BigDog