On this page https://extensions.openoffice.org/en/project/oracle-pdf-import-extension-openoffice-3x.html
the hyperlink to the OO 4 equivalent - PDF Import for Apache Office - is presently https://extensions.openoffice.org/en/node/17351/ and needs to be changed to https://extensions.openoffice.org/en/project/pdf-import-apache-openoffice.html
