When I run Stadd Pro 2004 on my desktop, it shows a message that no security device was found. What should I do?
When you receive that message, it means you will have to insert the USB/Serial device to one of the available ports of the computer. Once the device is attached, you can install it and then use STAAD.PRO. This is a common licensing system used by developer to prevent piracy. It's very effective because it works in 80 % of the cases. You will have to contact the developer of the software to acquire a security device like this.
You can find more information at the official website: http://www.bentley.com/en-US/Products/STAAD.Pro/