Although the glasses system is based on Android, Google Play Store is NOT currently enabled for application installation and management.
To install an application on the device, you can use ADB install over USB or WiFi, USB storage transfer over USB (glasses look like an MTP device), File Browser App installs using email attachments or web downloaded apks.
In addition,ODG has developed the Reticle OS AppCenter Store to enable developers to sell and distribute applications. You create an account using a valid email address (needed to receive an email from us to activate the account), and then you can log in from a browser or from the AppCenter client on the glasses.
See this reference: