if I install wp null demo of my buyer, does anything will be happen, let me know WP Expert?
A professional would not do it no matter if you get caught or not. So who are you?
Using null theme is very unethical. It has a high risk of getting website hack, As you don’t have an option for any automatic update there is a chance that website can get broke. And also theme author can send a DMCA to site owner. For both issue client will contact you first. If you can not solve it will obviously cause a problem. As a expert web developer you must not use any pirated/null theme or plugins.
thanks, actually some seller do that, so I just wanna know that.
They still have a lot of things to learn.