Open Settings. Click on System. Click on Storage. Click the Temporary files option for the main drive. Clear the current item selections. Check the Temporary Windows Installation files or Windows Setup temporary files item. Click the Remove files button. After you complete the steps, use the Windows Update settings again to download version 21H1.Why can’t I install 21h1 on my PC?
Outdated PC’s BIOS: If your PC’s BIOS is missing essential updates and patches, it may become incompatible with the latest Windows updates (like 21H1) and stop these updates from installing.How do I upgrade to 21h1?
I think you are talking about 21H1. Please try installing the latest feature update manually and let us know. The fastest way to get the upgrade is through the Media creation tool or ISO file. Please download the Media Creation Tool and select "Upgrade this PC now".How do I fix Windows Update issues installing the May 2021 update?
To fix Windows Update issues installing the May 2021 Update, use these steps: Open Settings. Click on Update & Security. Click on Troubleshoot. Click the Advanced troubleshooters option. Under the "Get up and running" section, select the Windows Update option.