Upgrade splunk from 4.3 to 5.0.3 not working

Hi,

I upgraded splunk from 4.3 to 5.0. What i did.

place the tar.gz achive in the folder where splunk folder is. stopped splunk untar the file , it replaced my older splunk directory. I changed the perms to splunk as how it was used to be. started splunk Now as i login to splunk, i still see older version.

even /splunk/bin/splunk --version also showing older version.

Can you please tell where and what is missing.

Thanks