Windows 10 Installation fails at 20%. Parallels Desktop for Mac, App Store version 1.8.

Greetings DavidW103,
Thank you for posting on Parallels Forum.
Letting you know that if you have M-Series Mac, the only supported Windows version is Windows 11.
Yes, you can try to install/create Windows 10 but the performance of Windows 10 will be very unstable, and like in your case installation may fail.
Therefore, to create Windows 11 virtual machine on M-Series Mac simply follow the steps below:
1. Double-click on Parallels icon.
2. In the window that appears, click "Continue".
3. In the window that appears, click "Get Windows 11 from Microsoft" > "Install Windows".
4. Wait until the virtual machine is installed.
Instruction with screenshots available here: https://kb.parallels.com/125375
If any issue appears, collect a technical report (Parallels icon > Help > Send Technical Data > Send Report > Attach Screenshots) then copy 9-digit ID of the report and send it in a reply message.
Should you have any additional questions, let us know.
Wishing you a wonderful week!