please go through this discussion for licensing detais
https://www-secure.symantec.com/connect/forums/liveupdate-expiration
let me try my best in answering your questions
- Do I need to renew my SEP License?
Yes you need to renew them, when ever they end.
- How renew process goes?
You need to contact licensing department they will help you out with that'
- http://customercare.symantec.com/
- If I renew and upgrade the version how can I deploy through exsisting setup. (Currently I use 75 Clients with Managed Console)
For symantec endpoint its just a paper license what you get , you dont need to insert / use them with your existing sep deployment,will run fine without license, license is for auditing and for your reference, you should never use more than what you subscribed for..
SEP 11 does not require a license file
Proof:
https://www-secure.symantec.com/connect/forums/increase-licensed-users-existing-sep
let me know if you have any questions..