Sorry to hear that you are still getting the error.
The only common reason i've seen for this error in the past has been from running the MSI file instead of the EXE.
Can you confirm if you have unzipped the install file after you downloaded it? It seems quite common for people to try and attempt the install by double clicking on the .zip file (as it 'acts' like a folder in Windows) and then trying to install.
Also, what is the operating system? Windows 7 or Windows 8?
Thank you for your reply Alex.
I am using windows 7 operating system.I have downloaded s/w again and unzipped folder and clicked on setup.exe file .Still i am facing same problem.
But typical option for existing p6 eppm is working fine.
but whenever i am installing p6 ppm r8.2 only using standalone option i am getting this error.
If the typical option is allowing the application to install, then i'd suggest just adding the database side of it manually.
The client application for PPM and EPPM in P6r8.2 and 8.3 is the same application (P6 Professional) and is 'smart' enough to enable/disable features depending on if it detects a PPM or EPPM database.
There should be an Oracle XE installation file in the download that you can install (personally I prefer SQL Server Express but you will need to enable Named Pipes and TCP/IP after it is installed).
I would recommend installing one of these, creating the database manually and then configure the install you have that is pointing to your EPPM database to also point to the PPM database you create after installing OracleXE/SQL Server Express.