"Before installing the nginx‑plus‑http2 package, you must remove the spdy parameter on all listen directives in your configuration (replace it with the http2 and ssl parameters to enable support for HTTP/2). With this package, NGINX Plus fails to start if any listen directives have the spdy parameter.
NGINX Plus R7 supports both SPDY and HTTP/2. In a future release we will deprecate support for SPDY. Google is deprecating SPDY in early 2016, making it unnecessary to support both protocols at that point."