Oh, you may say that about any product. Apple do not write that their apples you can’t eat. When you buy a car, it’s obvious that you also need a fuel, road, and drive license.
And what is most important. When you accidentally bought something that do not suit you, you can get back all your money.
There is no possible way to alert every person for everything. In another universe you may argue that Envato do not say that their creative items need computer. Or electricity!
Contact Envato support.