generating XML stack file in MOPZ for add-on install

I am installing the SAPUI5 User Interface add-on in a ECC6 EHP6 system.  After downloading the files and beginning to install in SAINT, I get an error saying that the add-on can only be installed using a Stack XML file.  When I downloaded the files using SolMan 7.1 MOPZ, I did not get an option to generate a XML file. 

So, in MOPZ when you are only downloading an add-on, not a EHP or Support Stack, how do you generate a Stack XML file?