Upgrading Windows 10 Mobile app to 1.1.1

I have a Nokia Lumia 535 running Windows 10 Mobile. I have OS build 10.0.14393.1593. I installed the Windows client from the App Store and got version which works in that I can connect to my Nextcloud 12.0.2 instance and see folders and files.

After reading the blog post I checked the Store and see version 1.1.1 is now available. The Store says the minimum OS version required is 10240 so I presume my device meets that criteria.

However, no matter what I try I cannot get the new version installed. Uninstalling, rebooting, installing just results in version being put back on. Is there a way I can force the new version on? Is it a glitch with the phone and the store?

Any help much appreciated as I would like to get the automatic uploads working.

In case anyone else runs into these problems: see GitHub.