1. Use the www.b3itlabs.com website
  2. Click on the "Products" label, than Headunit Reloaded Emulator for Android Auto
  3. Make your purchase via paypal, debit or credit card
  4. After that you will be redirected to the download page where you can choose the version you want

Important:
  1. Go to www.b3itlabs.com
  2. Click on the "Downloads" label
  3. Use the same e-mail address as the same as the one you used at purchase, and you will receive an e-mail with a new link.
       Each link is valid for 15 minutes, after 15 minutes your link will expire and you will need to follow the above steps, if you want to download the apk again 
       You can download the apk only one time, if you want to download the apk again  you need to follow the below steps