You will need to manually download the Google play services update file (apk) online. Follow these exact steps and it will work for you. First, go to settings> security> scroll down to unknown sources, tap to select the switch and turn it on. Now open this link https://google-play services.en.uptodown.com/android/download/1751067 tap on the download button, when a warning pops-up tap on OK to confirm. During the download, go to settings>storage>other>download and see the progress of the download. When its finished tap on the downloaded file, then allow for it to install. It will take around 10 to 15 minutes for the installation to complete. Once google play services is finished updating, tap done. Finally, restart the tablet. Google services will now be updated and all apps should start working. I hope that fixed your issue.
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