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Dependency

Java Runtime 1.6 or higher. (Oracle Java Version 7, OpenJDK 7, or IcedTea7 recommended, except Raspberry Pi: Oracle 8 Early Access, PowerPC: IBM SDK 7)
Determine your installed Java version here or type java -version at your command prompt.

Clean installs

Windows
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Download that file and run it.

Mac OS X
a9108ae86eba09b80a837b7db40b348cfbe403c6ed05cf2538f5fec2544c55e4

Download that file and double-click it (if that works) or type java -jar i2pinstall_0.9.12.jar in a terminal to run the installer. You may be able to right-click and select "Open with Java".

Command line (headless) install:

Download the 0.9.12 OSX graphical installer file above and run java -jar i2pinstall_0.9.12.jar -console from the command line.
GNU/Linux / BSD / Solaris
a9108ae86eba09b80a837b7db40b348cfbe403c6ed05cf2538f5fec2544c55e4

Download that file and double-click it (if that works) or type java -jar i2pinstall_0.9.12.jar in a terminal to run the installer. On some platforms you may be able to right-click and select "Open with Java".

Command line (headless) install:

Download the graphical installer file above and run java -jar i2pinstall_0.9.12.jar -console from the command line.
Android
a3d9cb2369a704570c1d45e8df48b7ecf459207d3609711e6cb2b093d69b0f2e

 

The I2P Android app is in development and does NOT currently provide strong anonymity. Requires Android 2.2 (Froyo) or higher. 512 MB RAM minimum; 1 GB recommended. The release and dev versions of the I2P APK are not compatible, as they are signed by zzz and str4d respectively. Uninstall one before installing the other.
Source package
71639369458bee414d1c319b1778d7f85301bd67aca738061961f2823f0f284e

Alternately, you can fetch the source from monotone or via Git from git.repo.i2p or Github.
Run (tar xjvf i2psource_0.9.12.tar.bz2 ; cd i2p-0.9.12 ; ant pkg) then either run the GUI installer or headless install as above.

The files are signed by zzz, whose key is here.

Post-install work

After running the installer on windows, simply click on the "Start I2P" button which will bring up the router console, which has further instructions.

On Unix-like systems, I2P can be started as a service using the "i2prouter" script, located in the directory you selected for I2P. Changing to that directory in a console and issuing "sh i2prouter status" should tell you the router's status. The arguments "start", "stop" and "restart" control the service. The router console can be accessed at its usual location. For users on OpenSolaris and other systems for which the wrapper (i2psvc) is not supported, start the router with "sh runplain.sh" instead.

When installing for the first time, please remember to adjust your NAT/firewall if you can, bearing in mind the Internet-facing ports I2P uses, described here among other ports. If you have successfully opened your port to inbound TCP, also enable inbound TCP on the configuration page.

Also, please review and adjust the bandwidth settings on the configuration page, as the default settings of 96 KBps down / 40 KBps up are fairly slow.

If you want to reach eepsites via your browser, have a look on the browser proxy setup page for an easy howto.

Updates from earlier releases:

Both automatic and manual upgrades are available for the release.

Automatic updates

If you are running 0.7.5 or later, your router should detect the new release. To upgrade simply click the 'Download Update' button on your router console when it appears.

Due to a bug in release 0.7.6, those whose first I2P installation was that version and have not upgraded manually may get a "downloaded version is not greater than current version" error, and should use the manual update method below.

If you are running 0.7.4 or earlier, please see the 0.7.5 release notes for important information about how to configure your router to automatically receive the release.

If you are running 0.6.1.30 or earlier, please see instructions for important information about how to configure your router to automatically receive the release.

  1. If you have reconfigured your router following the instructions, you should see a link on your router console allowing you to download and install the new release by just clicking on that link.
  2. Alternately, you can use the manual method specified below.
Manual updates
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  1. Download that file to your I2P installation directory and rename as i2pupdate.zip. (alternately, you can get the source as above and run "ant updater", then copy the resulting i2pupdate.zip to your I2P installation directory). You do NOT need to unzip that file.
  2. Click "Restart"
  3. Grab a cup of coffee and come back in 11 minutes
The file is signed by zzz, whose key is here.

Previous Releases

Previous releases are available on Google Code and Launchpad and within the I2P network on echelon.i2p.us.