I have a Microsoft Lumia 640 Dual Sim, running Windows Phone 8.1. I accidentally uninstalled WhatsApp from the phone. Now when I try to install it back from the store, i get an error asking me to try again later. The error code is c101a7e3 . I can successfully download and install other apps.

I have tried a soft rest as well as made repeated attempts over the past 5 days, but to no avail. Is there a remedy short of a hard reset?

  • Are parental controls set up for your Microsoft account?
    – Rowland Shaw
    Apr 1, 2016 at 10:01
  • 1
    No. parental controls have never been used on the phone. Apr 1, 2016 at 10:08
  • Have you visited Microsoft Care?? if not, do so. It will help. Apr 2, 2016 at 10:00
  • The best way to solve this issue is to retry later. Sadly the store has a few issues, I had stucked updates and failed installs multiple times a month. Waiting a few hour usually solves the issue usually. Apr 2, 2016 at 11:42
  • 1
    @KolappanNathan, Yes it is set to English India, and aligned. As I said, I can successfully download and install any other app that I tried; both the ones that I owned and since uninstalled, and ones that had never been installed on the phone. It is only WhatsApp that throws this error. Moreover, in the details, WhatsApp last updated date is December 2015, whereas it is March 2016 in my other devices. Apr 4, 2016 at 4:07

2 Answers 2



  1. Download via Wi-Fi and not cellular network.
  2. Assure that you have the correct time and date.
  3. Setting the correct time and date manually.
  4. Install on phone memory instead of memory card (or vice versa).
  5. Checked that your phone successfully runs its backups. If backup fails then Windows Phone can refuse to do several things, including doing update.
  6. Restarting your phone after doing any of the other bullets.
  • 1
    1. wifi only, not cellular. 2. checked, correct. 3. already manual 4. whatsapp does not allow installation on card, prompts install on phone memory only 5. as said, restarted multiple times. Apr 1, 2016 at 10:10
  • Have you checked that your phone can successfully run backups and update? If backup fails then Windows Phone can refuse to do several things. Apr 11, 2016 at 8:33

Go To Settings > Storage Sense > Store New Apps on my >

Change this setting to 'Phone' if 'SD Card' is selected.

After this change, WhatsApp should install and you can change back the setting.

  • As Vaibhav mentioned in the reply to previous answer Phone memory is already selected. Please read other answers posted before attempting to answer a question. The prev answer by PChristianFrost contains the step you said.
    – Kolappan N
    Apr 8, 2016 at 15:52

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