New installs

Precompiled jbigi libraries (for fast native crypto)

Download the appropriate library for your operating system and CPU, save it to your I2P installation directory and restart your router.

These are bundled under the LGPL license. Manual building instructions and signatures

Source installs

Updates from 0.3.1.1-0.3.4.2

Download lib.tar.bz2 and extract it from your I2P installation directory (overwriting lib/*). In addition, if you want to try out the upcoming web console, you'll need to download weblib.tar.bz2 and webapps.tar.bz2 as well, extracting both from your I2P installation directory (adding new files to lib/ and webapps/). The contents of weblib.tar.bz2 have not changed, so if you have it already, no need to fetch it again.

Updates from 0.3.1 and earlier

Sorry, no upgrade available. Please do a full clean install.