First download the attachment and unzip it somewhere on your disk.
Open the mappinScene.mb file from the unzipped folder and open the Skeleton Map tool (Atoms > Tools > Retargeting > Skeleton Map Tool).
Select the Hips joint (under RobotSkeleton1) and click on "Reload Target", then select the Hips_JNT (under RobotSkeleton2) and click on "Reload Source".
Now click on the Map button and select one of the two mapping methods. Now your UI should look like the one in the picture.
Provide a destination file path and click export.