Restart your computer. Check if Error code 0x80070005 in Windows Feature Update 1903 issue still occurs.

Method 6: Restart Windows Update Service to fix Error Code 0x80080005 A corrupted or incomplete downloading of windows updates can sometimes cause windows update Error 0x80070005. to occur.

Error code:0x80070005 is obviously an access error, telling me that it can't create a folder from which to install from. I've completely disabled UAC. I'm the only user on the system and admin.