Your link point to a .deb file which can be installed by dpkg, apt or the graphical package installer.
Just download the file and double click to install it. If that doesn't work, open the terminal, cd to your download folder
cd ~/Downloads and run
sudo apt install ./unifi_sysvinit_all.deb . You will then be asked to type your password blind. (It will not show how many characters you've typed, just hit enter when you're done). Wait for the installation to finish then you should find the app in the launch menu.
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Please help for installing Unifi controller on Deepin, How do I install Uni-Fi Controller?
Info : link
UniFi Network Application 7.3.76 for Debian/Ubuntu Linux and UniFi OS Consoles