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As a popular security tool a lot of Linux distribution includes it as package. Which means it can be downloaded from distribution specific package manager. Here are some of them
Fedora/RedHat/Centos
$ yum install nmap -y
Kali/Ubuntu/Debian
$ apt-get install nmap -y
Suse
$ yast install nmap -y
Windows
Windows have pre-build binaries and can be downloaded from here
Install From Source
Nmap can be installed from source. Source code can be get from official Nmap site.
https://nmap.org/dist/?C=M&O=D
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