"Currency" fails to upgrade from 1.09 to 1.10

The "Currency" app fails to upgrade from 1.09 to 1.10 (using F-Droid 0.102.3): "installation failed due to unknown error".

Uninstalling 1.09 and installing 1.10 works around this (at the loss of user data).

I have also reported this upstream at https://github.com/billthefarmer/currency/issues/22