the installation process changed since the new Qt installer update last week, we did not update the docs yet.
It’s best to use the V-Play installer from http://v-play.net/download/
(or use your existing V-Play installation) and add the plugin repository from this installer.
Please let us know if that fixed your issue.
PS: Selecting all Qt is not necessary – the dependencies for the plugins are resolved automatically. To make use of the plugins, Android armv7 is the mobile platform we recommend to use (but armv5 is fine too; or iOS if you are developing for iOS on a Mac).