Hubery
Unfortunately, if you are using PI 7.11, you cannot use any other NWDS version other than NWDS 7.11. That also means that you won't have access to all the new perspective (ESR, Process Integration Designer) and create iFlows because these are only available from NWDS 7.31 onwards which only works with PI 7.31 systems.
Introducing iFlow in PI 7.31 Configuration
On PI 7.11, you need to manually create classical configurations or ICOs.
Rgds
Eng Swee