Original post by: George A. ,
It is likely that you need to update your OS. Go to settings go to the bottom where it says "about tablet" and click on it. Then click on check for updates. If it doesn't have an update, then Acer likely dropped support for that tablet and now you won't be able to install many apps. While your in those settings, check your version of Android. Most apps only support 4.4 and up. Hope this helps!