can't install anything in systemsettings5

Usually run Tumbleweed but have installed Leap 15.4 (plasma) onto a spare laptop.
This is a clean / brand new install.
A problem I have run into is that I cannot download/install anything in systemsettings5 (icons, cursors etc).
I am given the error message.

Download of “Plasma 5-openSUSE V.2” failed, error: SETTINGS invalid number of concurrent streams

is there a workaround for this?

Search this forum for “invalid number of concurrent streams”.