I have Windows 8 (64 bit)

I wanted a Trial version of Project Professional, to see if this would be an option for me.
Microsoft Caht (Sales) gave me the following shortcut http://technet.microsoft.com/en-US/evalcenter/hh973401.aspx?WT%2Eintid1=ODC%5FENUS%5FFX103472268%5FXT104000919

I chose the 64 bit option

I downloaded file ProjectProfessional_x64_en-us
When I clicked on it, it comes up with the message "Sorry there was a problem mounting the file."

Although I can find the Events Log, Im really not sure what to look for there. I have tried downloading it again, replacing the file, to no avail.

Microsoft tech support does not support Trial options.

This file is a "Disk Image File" does that mean it wants me to burn it to disk before I can run it?

You might try reposting your inquiry in the Project Professional Forum.