Here is a link to the various 4.4 apk's, including Hangouts. Install at your own risk. I take no responsibility for any of these apk's. I installed Hangouts on my Nex4 and 7, and my wife's HTC One without issue. The One and my 7 are stock, but my 4 is rooted and rom'd. But no issues. The link is to the Nexus 4 part of the forum, but these are core apps and independent of device make. Link: http://forum.xda-developers.com/showthread.php?t=2506344 If linking to XDA is a violation of forum rules, someone please let me know, so I can delete this. Thanks.