Not sure why the PDF file is not opening. Can you open PDF files from Windows Explorer by double-clicking? Also, are your PDF files opening into Adobe Reader or a third-party PDF reader?
Without resolving why the PDF file is not opening from the Solid Edge screen, you can always manually open the file from Windows Explorer. The file is C:\Program Files\Solid Edge ST6\Program\ResDLLs\0009\testdrive_se2d.pdf