How can I get the modules for the new cameras that are supported to work with my older version of DxO PhotoLab ?

Unfortunately, this is not possible.  The modules are specifically created to be compatible with the newest version of DxO PhotoLab 3.  In order to use DxO PhotoLab with the newly supported cameras, you will need to upgrade to DxO PhotoLab 3.  You can upgrade to the latest version of DxO PhotoLab by logging into your online account with us at: 

https://shop.dxo.com/login_upgrade.php?CountryShow=International 

and clicking on the upgrade link for DxO PhotoLab 3. Our system will walk you through the upgrade process and calculate your cost based on what you currently own, your location and if any promotional pricing is available at the time of your purchase."