The fact it has no license makes it sound like it would be easier to use than if it did have a license, but it;s quite the opposite unfortunately. A license will at least tell you if you can’t or can’t use the item for your intended usage. A lack of license basically means that it belongs to somebody other than yourself, isn’t available for licensing, and you can’t use it in any way shape or form.
Although, if you mean it is in the public domain… then you might be able to use it. But you need to check that it really is int eh public domain. Bottom line, you need permission to use any item in an Envato item. If you don;t have permission (either specifically from the author of the item or in-line with the terms of any license) then you can’t use it.