Hi. :)

The download manager save the .exe files that are downloaded to install poser into a folder on your computer. If you would go to C: drive then Users then your name, then SmithMicroDLM, then Downloads/Content/Win (windows on mine as I downloaded the windows version. If you downloaded the Mac version look for Mac folder. ;) The .exe files in this folder can be saved in a backup. Also, if you have already installed the program you can find all files that have been installed in that same file path Downloads/Installed. 

Hope this helps. :) If you need any further help feel free to ask.