<A href="http://www.domino-weblog.nl/weblogs/domino_blog.nsf/dx/installing-8.5.3-upgrade-pack-1-and-keep-the-sbt-and-jdbc-extensions.htm" target="_blank">Frank van der Linden says installing the upgrade pack was easy and quick</A>. Everything looked fine, at first. Then he noticed some extensions were missing. He explains how to install the upgrade without killing the extensions.