A quick way to determine if your downloaded installer files are from the Install Now option is if there is a "wi" or "WI" in the name. In the example below:
- AutoCAD 2015 is using the Install Now technlogy.
- Autodesk Product Design Suite Ultimate 2014 is using the Browser Download.
The WI folder has a setup.exe in it. If you run it from there, you will get a Communication Error.
You can re-download the software as a Browser Download to solve this issue or re-run the Install Now option from the Subscription Center or Portal.