That is very strange. Are you downloading itt from “Your downloadable items” in your account dashboard.
I will normally get a download screen up from there which asks me if I want to save the file.
What browser are you using ?
It may work better if you try downloading it using another browser
Or it maybe that your AV is throwing you up an Error, which AV do you use,
BTW you did make certain you were downloading the correct file, as you will have several files, and if you are using poser you only need the one with the dpc.exe suffix.
Also are you using a PC or a MAc, that would make a difference, If you are a Mac then you need the one that dpc.zip as a suffix.