NightHawk app Failed

NightHawk R7000 router. My question seems to be with the nighthawk app not being able to download. No matter how many times I try to follow the troubleshooting guide. This is the only app that seems to be having trouble getting it to download through google play store on my note 9 smartphone. Please fix your app asap. I don't know why the heck would you do away with the link www.routerlogin.net and now I'm unable to go to that site to log in and change the password etc. Every time I type that adress it just takes me directly to your other site that has nothing whatsoever to do with what I was trying to get to.