The other reason that people fail the upgrade is that they do not realize that a lot of free space is needed in order for the update to install. If users have completed all the required steps before starting the installation process, the cause for the 0xC1900101 – 0x60016 error can be quite complicated.
How to fix error code 0xC1900101 upgrading to Windows 11
The error codes starting with 0xC1900101 or 0x80090011 can indicate various problems during the Windows 11 upgrade process.
These are the common "0xC1900101" errors that you may come across upgrading to Windows 11:
The setup of Windows 11 requires several gigabytes of space to process the upgrade. If the device does not have enough available space, you may see one of the 0xC1900101 error codes. You can get around this problem by using the "Storage" and "Apps & features" settings to free up space.
You can use this guide to find many tips to delete unnecessary files to free up storage space.
Disconnect devices
If the computer has peripherals like external drives, printers, Bluetooth devices, USB devices, cameras, disconnect them before proceeding to reduce the chances of errors and other issues upgrading to Windows 11. You can always reconnect them after the upgrade.
Uninstall security apps
If there is a problem with third-party security software, you will likely see the error codes 0xC1900101 0x20017 and 0xC1900101 0x30017.
Repair corrupted files
1. Press Windows + X keys altogether to launch the Power menu
2. Select Run option on the list and type cmd in the text box
3. Now press Ctrl + Shift + Enter to open Command Prompt as Admin
4. If the UAC dialog appears up, click Yes to authorize the access
5. On the elevated console, type the following command, and press Enter: