Dear Amna, 

thank you for your message. 

Actually you shouldn't be asked to insert a licence when installing a demo version. Please download WebSite X5 Professional 17 Demo from the following link: https://www.websitex5.com/download/v17/wsx5_pro_demo.exe

And please let me know if you are asked again to insert a licence. 

Thanks! Kind regards.

i need the license key for the program