Mac OS X 10.5.8 (9L31a)

i'll try to do it with an expert.
Tahks

I did what you say with the assistance of an informatic exert, but the program does't work on my mac.

Good evening,
I can not enter the serial number.
I installed the trial period and I bought the program, download version.
I open the program, I get "acceptance conditions", I click on the icon of acceptance and is in the dock and thenall the controls are inactive.
Can you help me, please?