Your device isn't compatible with this version

If clearing the Google Play app store cache didn't fix the issue, please wait for 24 hours and it should get resolved by itself.

Instructions on how to clear the cache just to make sure the steps were followed correctly:

Navigate to settings.

Applications.

Expand the application list.

Find Google Play store.

Select storage under the Google Play store app listing.

Select clear data.

Restart the Google Play store and try again.