Acrobat Customization Wizard - deploying Reader 2015 and not 2019 ?

I have installed the Acrobat Customization Wizard:
CustWiz1900820071_en_US_DC.exe

I have downloaded the Adobe reader DC 2019 version MSI:
AcroRdrDC1902120047_en_US.exe

I then used the customization wizard to use the MSI to generate a .MST to customize the installation, and then attempted an install using the files, however it installs Reader 2015 and not the latest version. Any ideas where I'm going wrong?