Mokriya, L.L.C. is the name of the awesome Silicon Valley firm we're partnering with to develop the Fluent Forever demo, beta version, and app.
You probably haven't downloaded a demo from Mokriya before. That's why your phone might warn you that Mokriya is a scary-sounding "Untrusted Enterprise Developer."
Then it will prompt you to update your profile settings to "trust" Mokriya before installing the demo app. It's safe to do so, we promise.
Just select the "install" and "trust" options as you go through the installation process on your phone.
Make sure you have the demo installation guide PDF handy. Haven't looked at the PDF guide yet? See What's HockeyApp and how do I install it? and get the guide for your iPhone or Android.