How to configure Jriver 19 to Airport Express

I use to work with Itunes and was streaming audio to another room using Apple's Airport Express. Everything worked fine. I started to use Jriver 19 about 6 months ago and now want to use the Airport Express device to stream music in my living room. I have read a ton of threads on the Internet and looked at JRiver help section, which is really useless on that subject.

I have read that I needed to install the DBpoweramp Asset UPnP audio server which should be compatible with JRiver. I have created a living room zone and a Airport Express zone in JRiver which I can both see in the 'Playing Now' menu section. I have downloaded the main Library into the living room zone and no audio playing, what could be the problem?
Airplay is supported as an audio device in Mac OS X. So you can set the Airport as the default Core Audio Sound Device and set JRiver's Audio output to go through Core Audio.

But I gather you are using a PC?
Because it does not support DSD downloads. I have purchased a Benchmark DAC2 HGC to be able to listen to DSD downloads. Little disappointments about poor availability of music DSDs in general.