It's unusual to have a System Reserved partition that is smaller than required, but sometimes third-party programs like security software may save data into this partition, which can be the reason that you can't install the April Update.
To fix this problem, you'll need to find a third-party tool to resize and make the System Reserved partition larger (at least 500MB).
In this case, you can use the Network Adapter troubleshooter available under "Find and fix other problems" in the Troubleshoot settings page to resolve this issue.
The error 0x800F0922 can indicate that your computer cannot contact the Microsoft's update servers, or it can mean that the System Reserved partition doesn't have enough space.
There are a number of errors that may appear, and they'll be different depending on the problem that caused them.
However, if you're having trouble, the quickest way to troubleshoot and resolve this issue is to use the Windows Update troubleshooter tool.
On Windows 10, you can uninstall applications using these steps: After completing the steps, repeat the instructions to remove any other conflicting applications.
Then try to upgrade one more time, and after the process, remember to reinstall your third-party antivirus or security software.
Windows Update, click the Check for updates button to try the upgrade one more time.
It worth noting that there could also be a problem with your device network adapter.
You can troubleshoot this problem doing a clean boot of Windows 10 and then try to go through the upgrade on more time.