http://i2peek-a-boo.i2p/i2pupdates/README.html
INSTRUCTIONS:
Download the update file of your choice, place it in /i2p or /.i2p and restart your router.
If you use the unsigned update url in your router, then restart when it indicates a new version as per normal
the unsigned urls are
http://i2peek-a-boo.i2p/i2pupdates/i2pupdate.zip
and
http://i2peek-a-boo.i2p/i2pupdates/withJavaDoc/i2pupdate.zip