I have Mac OS X 10.5.3. I seem to have trouble downloading a trial version of Photoshop from the Adobe site.

First off all, when I download it, two icons come up on the desktop. One is in .dmg file and the other is .dmg.part file. When I try to open the .dmg file, it says the disk image failed to mount, so I tried opening it with Disk Utility. It says the file can not be recongised. So I tried opening the other icon (.dmg.part). Disk Utility opens, but other than that nothing at all occurs. It doesn't even come up on the Disk Utility.

I've tried to find a solution but so far nothing has worked...

Any suggestions?