clone website script and ,modified it

[login to view URL] i want to have software programe of this site . wanted all feature but design it look not extact like this site . copywrite problem . i also using this , but having some problem like Critical Error Your License Key is incorrect, please, make sure the host IP Address or Host Name was not changed. Contact to get new key, just make sure to include your PMR version number. If can design the script into open source and not using what key , so can use for many site or free programe for others to use . and window server or linux also can be use together can you do it