I can't find my download to open it

Hi,
I'm new to this forum.
My problem is that I downloaded Adobe Photoshop Lightroom 4 In Bitcomet & it downloaded 100%.
However, I can't find the program in my PC. (XP).
I did a search & found it in documents (I think).
I clicked on it & it came up saying install US English. I clicked OK & it started extracting. Then it said preparing to install & after a while waiting it said to contact my vendor.
Just wondering as to what I'm doing wrong.
Is it a case that I open the program from Bitcomet.
If so, how do I do this?
I thought the program would be saved to the desktop, but no.
I would appreciate any help with this.