When you don't have enough disk space for Windows updates, there is a tutorial on MakeTechEasier that explains what you can do.
How to Fix the “Not Enough Disk Space for Windows Update” Error
What does it mean when your Windows device says you don’t have enough disk space for an update even though it appears that you do? At times the System files, apps, reserved storage, and virtual memory can overconsume the available space for a proper update. This leads to a “not enough disk space for Windows Update” or “Windows needs more space” message. Follow the solutions below to fix this problem.
How to Fix the “Not Enough Disk Space for Windows Update” Error
