Go to the ExpressVPN official website. go to the Downloads and select Routers Option and then from there, select your router on which you want to. After that Login into the Linksys router settings(make sure your computer is connected to the Linksys router’s network). Once you are logged in, then Go to the connectivity Option
Under the firmware option, select manual and select the file that your extracted and after it will install the express VPN firmware on your router.