Please excuse the delay in responding.
First, I was having issues with my e-mail, so I created a new account here, this one, scotty_ncc1701, AND I WON'T BE USING THE ANON32028 account again. The issues with the e-mail have been resolved. Because of the problems with my e-mail, I didn't get a notice of your post.
The issue I'm having, was that I couldn't get KB2919355 (WINDOWS 8.1 UPDATE 1) to successfully download and/or install from the Control Panel/Update area. So I had to go through the Microsoft Update Catalog. I'd download it from there, install KB2919355 (WINDOWS 8.1 UPDATE 1) manually (there were 5 individual "KB's" in the initial one, then 6 in the 2014_04_17 update). Each had to be installed in a specific order. Then run the rest of the remaining updates through the Control Panel/Update area.
I'm on another site, and some of the users are confused that their installed update area showed KB2919355 twice. What M$ did was on the update on 2015_04_17, only downloaded things that changed, not the entire update. Per M$: "Windows Update may offer update 2919355 again even when the computer already have update 2919355 installed. This is expected and is in order to resolve a Windows Update client issue. Windows Update only installs the additional fixes for Windows Update clients instead of all the Windows 8.1 update packages".
Please excuse the ACCIDENTAL MISLEADING. I don't have the problem you have. Even though M$ said "Windows Update only installs the additional fixes for Windows Update clients instead of all the Windows 8.1 update packages", you (in the general sense, not you specifically), don't know what else they updated. I always like keeping my system up to date.
Have a good day, AND GOOD LUCK.