Gospel Library (Beta) won't update - store issue?

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The newer Gospel Library app (the one that looks like the Android/Apple versions) after I did the initial Beta install for Windows Phone, whenever there's an update, I try to update, but the update fails, and I get the Windows store error code 80073cf9. I searched the internet to find out how to resolve this error, but none of the 'solutions' works. The ONLY WAY I found to update to a newer app version is to RESET MY PHONE. Only then would it successfully install. But then, whenever another update became available, updating would fail (whether I try to update, or uninstall the older version and then try to install the updated version). So again, the only way to update is to reset my phone again. Same issue with Gospel Library official version, besides Beta version. I have an HTC 8XT Windows Phone 8.1. Help, please? Developers, fix this issue, please?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References tech.lds.org/forum/viewtopic.php?t=22659

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