Printoid PRO does not exist anymore. This variant of Printoid has been unpublished one year ago.
Only Printoid LITE (for free) and Printoid PREMIUM (paid version) remain published on Google Play.
Why?
What can I do?
If you still use Printoid PRO, you can continue to use it as long as you have the app installed on your device.
If you need to re-install it, you can download and install the APK manually.
Otherwise you can obtain a migration to Printoid PREMIUM! And that’s explained here.
Printoid for OctoPrint 