Snow Leopard with TV 9.x cannot be controlled by iPad pro with TV 14.x

Hello everyone, i’m trying to access from iPad pro 12.9 (2nd gen) with TeamViewer 14.x to an iMac 2011 with Snow Leopard and TeamViewer 9.x. It worked in the past but i guess after the latest updates (on the iPad) it ain’t possible anymore. Of course i cannot update to newer versions on the iMac and i don’t want to update the OS since that machine must work in a strict  software environment. Any clue?

Cheers, Sam.