Xce,
If you are a registered Insider, then please logon system using your registered Microsoft Account, then on the advanced options under Windows Update, make sure we have swithced to the fast ring and ready for the new builds. Then check for updates again.
If we have already done the steps above, then please check Windows Update and see if any errors reported.
Besides, we may try the method below and see if it could help:
1. Go into "C:\Windows\SoftwareDistribution\Download" and delete everything in that folder.
2. Now, run the command prompt as an administrator. Type in "wuauclt.exe /updatenow".
3. Go to your Control Panel > Windows Update and your Windows 10 should start re-downloading from scratch, hopefully without flaws this time.
R