Error 0xC1900101 – 0x20005 Installing / Upgrading Windows Technical Preview

Either you are installing Windows Technical Preview or upgrading Build 9841 to Build 9860, you are very likely to encounter the error:

0xC1900101 – 0x20005

The cause of this error is that you don’t have enough free space in System Drive/ Drive C:

To solve this, simplely allocate more disk space to Drive C: –  at lease 50G free space is needed.


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