I was able to install both Installation Manager and RDi on Catalina, but after upgrading to Big Sur - Installation Manager is not working. It launches with a blank window with the text "Failed to create the part's controls" and a dialog with a java.lang.NullPointerException.
RDi that was installed on Catalina prior to upgrading to Big Sur is still working, but I need Installation Manager in order to upgrade RDi.
Anyone using MacOS Big Sur and RDi/Installation Manager successfully?
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