Missing something - Android etc clients?

So my Roon Remote app updated on my Android phone, and it won’t connect. Tells me the device is no longer compatible. Says I have to upgrade the Core to connect.

Have no intention yet for updating the Core, so what do we do now for Android and iOS? Do we need to install a new client? Are we forced to upgrade?

Is this the same as this? Roon 2.0 broke Roon Remote - #19 by Rnlifer