http://yggdrasil.acetone.i2p/doku.php?id=en:i2p
Also i2pd exists in the standard repositories of some unix-like operating systems like Debian or Ubuntu, and is available for installation via the short line sudo apt-get install i2pd , but this installation method is not recommended, since there are always very outdated versions in the default repositories. However, there is an up-to-date community repository, adding which to your system, you can forget about rotten packages and update in a familiar and convenient way.