The following icons are open source. Can I include them in the download package of the template that I will upload?
Yep! It’s in the title and in the about page.
3Dicons is a set of beautifully crafted open-source 3D icons that have been created in Blender and made available to the community. It has been released under a Creative Commons CC0 license, and hence it is free to use for personal and commercial projects, as well as copying, editing, remixing, sharing, and redrawing. This resource will make it easier for designers and content creators to produce beautiful and effective designs in less time.