0x80070070
There is not enough disk space to install the update.
How to fix it
- Free space: Settings > System > Storage > Temporary files, then remove "Windows Update Cleanup" and "Downloads" if safe.
- Empty the Recycle Bin and uninstall programs you do not use.
- Feature updates need about 20 GB free on C:.
Is it serious?
If your drive is 128 GB or smaller and always full, a bigger SSD is the real fix.