Nitro PDF Professional 6.

I have installed Nitro PDF Professional 6, in midway of the installation
it pop a message " Originally licensed on a different computer ". What do it mean by that. I do not remember when I have installed it. I may have uninstalled it long ago but there are some remnants left I think. The problem is where is the file hidden and how to solve. My OS. XP Pro SP3. Thanks.

 

Thanks 'TonyT' I have visted the site as mentioned earlier. In the Licence Manager what it mean by 'licence number', I may already uninstalled it, what I used is the free Primo PDF (this computer is a clone as I have update to a larger Hdd). Where am I going to find the number. As I have stated I could not open the nitro pdf program. Hope to hear more for your advise. Thanks.