The Unified Push and Simple Push server links on http://aerogear.org/download/ point to the 0.8.0 links instead of the 0.8.1 as follows
http://dl.bintray.com/matzew/AeroGear-UnifiedPush/org/jboss/aerogear/unifiedpush/aerogear-unifiedpush-server/0.8.1/#aerogear-unifiedpush-server-0.8.1.war
https://github.com/aerogear/aerogear-simplepush-server/zipball/0.8.1