Hi,
I believe that you wanted me to download FRST X86 instead of FRST x64, as my laptop is of 32-bit architecture. I therefore downloaded FRST (compatible with 32-bit) instead of FRST64.
I ran the dism command as advised by you in the elevated mode. The execution is successful.
I then ran FRST as an administrator and searched Registry for KB3139398. Attached is the resultant Log for your reference.