I am running the latest version of Mojave and Windows 10. Also running latest Winclone 7.3.4 version of the software. My windows 10 bootcamp drive is mounted. I can click on it to see the files. When I run Create Image from Volume, bootcamp disk is grayed out. When I click on Select Volume, it shows that it is the Windows 10 partition. Save Image is also greyed out.
Click on the button, then click on the Windows 10 volume, and that will “ungray” the main image.