I'm getting this error right now while trying to install using the Professional v5.1 from an ISO onto a 250GB drive. The drive was partitioned into 249.90 GB and 100 MB partitions. I've tried all 3 installation modes.
Please send the user.log file to us via [email protected], the user.log file is located in the bin folder under the installation directory of WinToUSB, and we will resolve it as soon as possible. Thanks.