I am using Lumia 535 OS Windows 8.1. Facing problem when installing the Whatsapp. It is showing "Attention required, tap here" as I tap there, showing as "we are having trouble connecting to the Store at the moment. Try again in a little while. If I click on "Try again" same thing comes again.
I am not using a SD Card. Whatsapp application is in Windows phone only.
Check your internet connection first I think. I face this problem when my wifi connection disconnects or speed becomes slow. And also do check in your settings what type of file you have selected to download when on Wifi and when on Cellular Network.
Had same issue with a Game, and I never managed to re-install it. Finally I did a complete back up and hard reset my Phone. That was the only solution.
Waiting for an easier workaround.
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