Here ya go.
This is the apk but for dev build.
App Lounge Store 0.2.0 dev
Alternatively you can get the apk you need to match your build from the zip files.
applounge_reldev-artifacts.zip
applounge_relstable-artifacts.zip
On my 1.8.1-q the apk installs like a normal update. Maybe reboot for good measure.
Then test an app like Stellarium. It should now not error and run fine.