Download the latest release for your specific Operating System via the NIX website or direct from GitHub. For MacOS and Windows, simply click on the .exe/.dmg file to begin installation. For all others, unpack the .tar.gz or .zip file and copy the binary/executable files to the appropriate location to install for all users, or simply execute them from where ever you unpacked them if no other users need access.
For Windows 64-bit architectures. This release includes an installer and is most likely the release you want to download if you are a Windows user.
For Windows 64-bit architectures. Executable files only (no installer). Includes nixd for VPS applications.
For OS X. This release includes an installer.
For OS X. Exectutable files only (no installer). Includes nixd for VPS applications.
For MacOS 10, 64-bit architectures.
For Linux 64-bit architectures. Binary files are found in the /bin directory.
For Linux 32-bit architectures. Binary files are found in the /bin directory.
ARM processors are extensively used in consumer electronic devices such as smartphones, tablets, multimedia players and other mobile devices, such as wearables. Because of their reduced instruction set, they require fewer transistors, which enables a smaller die size for the integrated circuitry (IC). Chances are slim this is the release you are looking for.
AArch64 is the name for the new 64-bit ARM architecture, also known as ARMv8 or ARM64. Hardware designed for this hardware specification is new, and still developing. Chances are slim this is the release you are looking for.
If you wish to compile the binary/executable files yourself, the source code is available in .zip and .tar.gz compressed file formats. Note that you will also need to have all required and optional dependencies already installed in order to successfully compile from source code.