The latest Window Update (2020-03 Cumulative Update) causes a problem when updating Concept Office to its latest version. This locks out the main Concept Office folder from updating preventing the update to update all the Concept Office folders. This will pop up as warning (in German) like the one below:
Write access for \\file\daa\Concept Office\HTML\Content\Icons\64x64\ is not possible. The folder may vary depending on your personal Concept Office installation.
A temporary fix is to deinstall update (2020-03 Cumulative Update). After deleting this update Concept Office can be patched just like usually. As this fix is only temporary our developers are working hard on a final solution for this problem This fix will come soon in another patch.