If the set up files are installed on a desktop all ready then there is no need to re install them to the laptop. The desktop serves as the modem/router and the only configuration that must be done is possible the adding of an IP address for the laptop to be used by the desktop to figure the routing sequence.

Open help and support in the laptop and query the networking for how to perform the set up configuration using a desktop (connecting through another computer) It will have all the answers that you need for figuring the network!