There are two types of Silhouette, the Basic Silhouette that you get for free with you cutting machine and the Designer Edition that you buy from Silhouette for approximate 50$.

The Basic Silhouette can one just DXF files.
The Designer Edition Silhouette can open more types, like DXF, SVG, etc.
View this site to see all format files that they accept:
http://svgcuts.com/blog/wp-content/uploads/2013/12/silhouette-studio-version-comparison.pdf

If the above item have DXF files you can use them with your Basic Silhouette.
If the above item have just SVG (no DXF) you can use them just with you Designer Edition Silhouette. (no Basic Silhouette)

If the above item have SVG files, yes it will work with you Cricut cutting machine.

The props with shadows and highlights are not recommended to be used with Cricut, because the transparent colors, will lose their transparency when they are imported to Cricut.

You are NOT allow to use my designs (whole or parts of them) to create and sell digital items, designs or files.

You are NOT allowed to upload them to any site, for personal or commercial use.

The designs are copyrights of HaHaHaArt and they are protected by law.

Yes, you can create and sell physical items like t-shirts, cups, etc.
You can print, cut, put the designs on any physical item.

But you are NOT allowed to upload the designs/files to any print on demand site such as Cafe Press, Zazzle, Tee Spring, etc.

If you create more then 100 products using HaHaHaArt designs, please contact me, because you will need an extended licence.

The designs can not be used to create and sell embroidery files on Etsy or other sites.

Digital commercial use is NOT allowed. The designs can't be used for any digital items, files or designs.