What computer operating system is your Premiere Elements 9 running? The 9.0.1 Update is important. If not already installed, please do so.
For Windows (already given when assumed your Premiere Elements 9 was on Windows)
Alternative sources for obtaining tryout files into which to insert your purchased serial number are:
With the latter web site, be sure to follow carefully the web page's "Note: Very Important Instructions" to avoid an Access Denied message.
Just in case mention, double check that you are downloading the installation files (2 for Windows and 1 for Mac) for the appropriate computer operating system.
Please review and consider and the let us know the outcome.