Why do u want to install coiscorp 3.4 when 3.6 is out? & you have all the relivant stuff i.e (BUL etc) to run back up discs etc!
But if you do want to install cioscorp u may as well run 3.6, (Do not deleate any IOS etc,When you install such things as cioscorp it just overwrites old ios's & so on.
Make sure you read the READ ME file when installing anything & take your time to! (if unsure don't do it) + B4 you start make a nand back up (if you can)!
On the read me file it will let you know if your serial num is compatible.
Good luck & hope this helps.