I believe you can demo it for free. Give it a try.
And, try tuxguitar.com, it's free and very similar to GuitarPro. Compare the two and decide if the $60 is worth whatever advantages there are between the two.
Also, tuxguitar can read guitarpro files.
http://tuxguitar.herac.com.ar/
I don't know of the availability of jazz tunes in GuitarPro (I just use the real book for tunes, I use notation software to write up transcriptions that I'm doing or to write out arrangements or orginal compositions for the band I play with).