Trying to update from the1909 version to 2004 or 20H2?

Error 0xc1900104cropping up inWindows 10?

This kind ofupdate errorwas seen in the earlier version of 1703 too.

Windows 10 Update Troubleshooter

But the main reason could be thesystem partition size.

It needs to be 500MB of size for normal things to work out.

Users ofMicrosoft Surface Pro 6had their feature updates hang at 61% while upgrading from 1909 to 2004.

Disk Management System Partition Size

This was happening even after trying for 3 times.

Another cause could be that the updatedownload foldercould be corrupted.

Generally, Windows 10 saves the update files in a folder calledSoftwareDistribution.

To fix theWindows 10 Update error 0xc1900104you can try the following solutions.

This should resolve theUpdate Error Code 0xc1900104.

Solution #2 Try the Windows Update Troubleshooter

Sometimes, this can solve the error.

Either the system drive is full or the hard-drive got corrupted for some reasons.

In that case, you might change the download folder location for Windows 10 updates.

Create another folder DownloadWindows10Updates in another drive which has sufficient disk space.

The default Windows 10 update download location isC:\Windows\SoftwareDistribution.

Use solution #1, to rename that folder.

Enter the following command in the elevated command prompt.

Then restart the Windows Update service if it is disabled.

it’s possible for you to do it from the Services window or bang out the following command.

The following is the link where it’s possible for you to download the recent update https://www.microsoft.com/en-us/software-download/windows10.

TheUpdate Assistantwill help you update to the latest 20H2 version.

As per the latest update, 500MB of free space is required.

If it is low, you’re gonna wanna increase the space.

Then add that space to the system partition.

Sometimes, the C: drive becomes very small.

you oughta extend this partition.

If there isunallocated spacenext to the C: partition, then you might extend it.

Make use of any partition manager software to do this.

Sometimes, it is not possible by the system tools of Windows 10.