Where to download android client?
You can easily find the link in the OP.
The only hindrance is that it isn't listed as Google Play ready hence not being searchable on the store.
If that could be done then any non-standard crypto user who searches up the name VanillaCoin will see the Android wallet & get into VNL almost instantly.
I guess the final release will be listed on Google Play just as the iOS app will be on AppStore (now it's on the official TestFlight program), so that shouldn't be a problem.