I'm not sure whether there's a way to get rid of the constraint, but if you add mixin mix:versionable to your jcr:content nodes in your 6.1 environment, the jcr:uuid property will be created and populated automatically for you. That may allow you recreate the package and install.

http://experience-aem.blogspot.com/2015/10/aem-61-touchui-rich-text-editor-color-picker-plugin.htmlThis article has been suggested several times, but refers to adding the color picker to the RTE. What about dialogs. The documented settings don't seem to have any effect. How do we use freestylePaletteType? https://docs.adobe.com/docs/en/aem/6-0/develop/ref/granite-ui/api/jcr_root/libs/granite/ui/components/foundation/form/colorpicker/index.html?highlight=colorpicker