Hello,
Have a client who has 11.0.5 deployed and I want to upgrade them to the latest. Does the new install (12.1) upgrade version 11 or will I need to uninstall 11 and deploy from scratch?
Yes, you could migrate from SEP 11.0.5002 to SEP 12.1.2015 (SEP 12.1 RU2) directly.
Check this Article:
Best practices for upgrading to Symantec Endpoint Protection 12.1.2
http://www.symantec.com/docs/TECH163700
Recently, a new patch has been released - 12.1.2100.2093 (SEP 12.1 RU2 MP1)
It is important to understand that SEP 12.1 RU2 MP1 is a maintainance patch and could be applied only over SEP 12.1 RU2.
Check this Article:
Upgrading or migrating to Symantec Endpoint Protection 12.1.2100 (RU2 MP1)
http://www.symantec.com/docs/TECH204449
It states:
"Migration paths
Symantec Endpoint Protection 12.1.2100.2093 (RU2 MP1) can migrate seamlessly over the following:
Symantec Endpoint Protection 12.1.2015.2015 (RU2)"
In other words, the Migration path would be:
Older version than SEP 12.1 RU2 >> SEP 12.1 RU2 >> SEP 12.1 RU2 MP1
Hope that helps!!