Manually download and install the following patches.
I recommended to disconnect your PC from the internet and do a restart before you install these.
- Service Pack 1, if you don't have it already
- KB3020369 Servicing Stack 2015
- KB3102810 High CPU Fix
- KB3125574 Convenience Rollup
- KB3177467 Servicing Stack 2016
If you still have issues after that, then try WSUS Offline to download and apply the updates.
For a walkthrough tutorial and more information, see this video.