yea, I really didn't do that. All my updates are installed on SSD disc - on C: disc. On HDD are specially movies and games. I never changed the path of installation.
What is your PC model? Even my Acer Predator Helios 300 has an SSD and an HDD. And the update installed successfully through manual installation though. I don't rely on Windows Update anymore for these big updates of >100MB in size.