The hot-fixes for the 5.5 are available at the following link. You need a connect account for downloading them. Then transfer them onto the server and install in the admin center as local packages.
https://connect.nuxeo.com/nuxeo/site/marketplace/hotfixes/cap-5.5 --- Mailing list: [email protected] Forum: http://forum.nuxeo.org/f/1/
