So there is a temporary fix but it’s very hacky and maybe outside the ability of many people… but here it is:
If using Docker (hass.io)
from ssh (or a console in portainer - don’t need the first command)
docker exec -t -i homeassistant /bin/bash
and change the version to 99 and 4 then restart home assistant
If using hassbian:
Edit the same const.py in /srv/homeassistant/lib/python3.7/site-packages/homeassistant/
Once you edit the file, restart home assistant.
I have done this in hass.io and the app works again.
You will get the splash screen saying 99.4 but the system health will say 0.100.1 Also the iOS app will say 0.100.1
You will need to repeat this if 0.100.2 comes out before the fix to the iOS app.
Like I said it’s a nasty hack. If you have a version sensor it may tell you to upgrade as well.