What is your OS ? and from where are downloading the software , Adobe.com account or as a trial.?
As Manish-Sharma said, we need more info.
My OS is Windows 7, I am downloading it from Adobe.com as a trial.
Run the Adobe CS Cleaner Tool and remove the product that you are going to install. See Resolve installation problems with CS Cleaner Toolhttp://kb2.adobe.com/cps/829/cpsid_82947.html
Download Premier Pro from the mentioned link:
HOW TO DOWNLOAD
You need to be registered on www.adobe.com to gain access to downloads.
Register and then request for a product trial for example Lightroom trial, log in, cancel the download, you're good to go with the URL below.