Thank you for your interest on our Slingplayer for windows 8 phones. I am happy to let you know that window 8 phones are supported by the app and the Nokia 920 should run the app if its just running the regular window 8 platform. Ill post a little more information in a link below.
Hope this helps,
Sling Moderation Team
In addition, this slingplayer for winphone also does not seem to work on my Slingbox PRO either (I haven't confirmed yet but that's what it says on sling's official website, so I dare not shell out $$$ just to donwload something that probably won't work).
I really dunno why this is the case. I would have happily paid for the download if compatibility is gauranteed. Doesn't slingbox want to make more money?