Get Wii Backup Manager, add the file, then check it, go to transfer and click in Convert to ISO
"CRC 0C597990 not in Redump or Custom Dat"
The bundled Redump.dat file is old and doesn't have that game. Download the current Wii dat from redump.org and swap it in.
I should also add a worldwide bundle since the current bundle only includes US partitions.