Hello,
1 - In fact, you need to put all of them in the folder : "D:\winreducerex70\WORK\INTEGRATE\UPDATES\x64\Updates" (WinReducer Updates default folder structure)
2 - In WinReducer, just let the default choice when you hit "..." button (the correct folder is automatically selected, according to your mounted ISO architecture : x86 or x64)
Example: for an x64 ISO, the correct folder is "...\winreducerex70\WORK\INTEGRATE\UPDATES\x64"
You could have some additional information in this thread : https://forum.winreducer.net/t1409-winreducer-ex-70-catalog-updates-v2015-07-1#12662