@Kalman Jantner The work around for this issue is to try to manually delete zeppelin packages of the current version from the terminal using yum remove zeppelin_2_4_0* Then click on to the down arrow of Perform Upgrade button and select Reinstall Packages. Check if this works. If you want to downgrade your cluster later, delete the zeppelin package of 2.4.2 version and downgrade it to 2.4.0. ... View more