Howdy?
I've been getting this error message today.
"File couldn't be downloaded. Do you want to retry?"
Just like sabao8 tried changing the folder location, disabling Windows Defender and running as administrator. Upon reading all the way here, maybe the mirror is missing the file?
Edit1. To add image with latest patcher. Same 37% always.
Edit2 to
1-Remove expired images about the error.
2-Patcher working after mirror owner added the missing file to the mirror.