Upgrading Kupu in Plone is not that difficult.
First you need to download the latest Kupu files from:
http://plone.org/products/kupu
Then you should rename your old kupu folder to, for example, kupu-old. The default kupu directory is:
/opt/Plone-2.5/zeocluster/Products/kupu
(the version of your Plone instance may be different)
Extract the latest kupu in /opt/Plone-2.5/zeocluster/Products and then restart Zope.
After that log in to Plone and go to > preferences > Add/Remove Products. Under Installed products you will see your kupu version, as well as a message saying that the files have been upgraded. Follow the link to reinstall kupu and this will complete the kupu upgrade.
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