I did install the previous font x version 2.3 and then updated it to 2.6 i think it is. Because the previous version did not have indesign 3.5.1 (CC).
After the install the plugin option was there for CC 3.5.1
I will contact font explorer in the morning to find out more. This is a new laptop with fresh install of indesign CC and font manager.
Thanks for the tip.
Cheers