I was not clear, excuse me.
Head to Settings/Reboot menu, there’s a button called „Update2Beta Max2Play“ in the middle of the page. After the update, you should see the date of the current beta displayed in the top right corner.
However, we also just released a fix for GMusic Plugin in our Stretch Image beta. If it works correctly, we will include it in the official next version 2.46 of Max2Play. You can check it out already as a Premium member (beta updates are Premium only).