Fromwhere i can download the trail version of window server backup product?
...seriously...? BE 12.5 which was EoL a couple of years ago? BE 2010 R3 at least supports some newer applications, OS and hardware.
Please don't post irrelevant information. BE 2012, yes, but you should be linking to nothing earlier.
Alternative ways to access Backup Exec Technical Support:
Choose the second download link as BE 2012 is the current version of Backup Exec. And do have a look @ the Software Compatibility List for this version - http://www.symantec.com/business/support/index?page=content&id=TECH175581
If you can wait a while longer, you should wait for BE 2014 which is due to be released soon
I just need it for the knowledge base and testing.
...then for now, download BE 2012 and play around with it. BE 2014 has the same look and feel while bringing back a number of features to BE 2014 that were revmoed when BE 2012 was released.