Good morning - downloaded some windows updates from Microsoft last night that resolved all Microsoft Store Error code issues I reported on April 10. My Dell windows 8.1 tablets are now all able to download and install apps from the Microsoft Store with no error codes. In my case the error code 0xc03f300d has been addressed and fixed - Thank you Microsoft and to all who assisted in coming up with the fix.
My suggestion for the windows 8.1 users that are still having the error code 0xc03f300d issue is to perform Windows Update until there are no more updates to add to your device. Under Windows Update/Change Settings - my settings for windows update are:
- install updates automatically
- Give me recommended updates the same way I receive important updates
- Give me updates for other Microsoft products when I update windows
I then waited patiently for updates to install and restarted my computer after each update cycle until there were no more updates. You can then change your windows update settings back to what you want. Good luck to everyone and if there is still an issue don't be shy to call and report your issue to Microsoft.