I received this error when I downloaded the apk: Sorry, cannot package projects larger than 30 MB. Yours is 34,34 MB.
Why is your App over 30MB? Could it be that it is not optimal? Do you use images in your App? If so, are they optimised for Android? That alone might get your 34MB down to below the 30MB mark, and remove further potential problems down the line.
See the tips and tricks on my website:
https://www.professorcad.co.uk/appinventortips#TipsApk Cannot Build/Install/Run APK
Try this server (aia < 50 MB):
You can clone a local instance of app inventor in your pc and modify the code