Yeah, not going risk trying to upgrade it, but my problem is my SSL is tied to my server contract for a year so can not really swap servers to be able to start with one that's already got centos.
Main thing i want to do is get http/2 up and running but plesk only support the version of nginx that's old 1.9.4 and does not support it and my apache is only 2.2.
I have been able to get mariaDB 10.0.23 installed so thats a plus, but can not find any clear guide or info on getting http/2 up and running on plesk 12.5.30 and Centos 6.7