Hi,
Not sure what you mean by D/I (is it download /install?)
Try downloading the Play Store.apk file to a computer, then transferring it over to the tablet, either to the external SD card or the internal storage.(remember the location). Enable the Unknown Sources (Allow installation of apps from unknown sources) option in the Security Section of the Settings menu ( it may be somewhere else in the Settings area of your device), then use a File Manager app to install the app by finding and tapping on the file.
Remember to disable the Unknown Sources option when you are finished so as to protect your device.
Here is a link.
http://www.androidapksfree.com/apk/google-play-store-apk-latest-version-download/