Accept the internal test invite
Once you have received an invite to test an app, follow these steps to accept the invite:- First, make sure you are logged into the correct email on both the Play Store application and the email application (e.g., Gmail):

- Click on the image in the top right corner and make sure you are selecting the account you want to accept the invite from:

- Next, click on the invite email you received for the closed testing invite and click on Become a Tester:

Note:
If you see this screen, you are not logged into the correct Gmail account:
To switch the account, click on the square in the top right corner where the red arrow is pointing, then switch to the appropriate account.

Install the internal test app
- Once you have accepted the invite, click on the Install the public version on Google Play hyperlink text as shown in the screenshot above
Note:
If you load into a completely blank screen that does not do anything:
This is usually caused by being logged into the wrong Play Store email. Press back to exit out of the invite page, press the home button, then open up the Play Store from the app drawer. Once opened, change to the correct account.

- If all goes well, you should be directed straight to the app download page. Install it, log in with your credentials, and you can test away.