Here's a direct link to the app on the play store:
https://play.google.com/store/apps/details?id=com.disney.mdx.wdw.google
If you're singed into the same Google account on both your PC and tablet, you can install it from your PC via that link. Or if you click that link from your tablet, it should prompt you to open it with Google Play and you can install if from there.
There's also a very small chance your tablet is running a version of Android that's incompatible with the MDE app, but it would have be be a pretty ancient tablet running a version <2.3.