Update Blend Files
Blend files using Decals created in DECALmachine 1.8/1.9 need to be updated, to take advantage of the new Decal Material features and the new Decal Texture format.
The tool to update .blend files is located in the the Update Decals panel.
Blend files using Decals created in DECALmachine 1.4.2 or earlier can at this time not be updated. If you absolutely have to do this anyway, get in touch.
To Update .blend files, you have to update the decals used in those files first.