Latest eLCC 6.12.1 (30 April 2020). There are important fixes in it (especially for Mac).
Confirmed, this fixes a number of errors on Catalina (makes no difference on Win10 1909, that always worked).
Until now, I’d thought this was the fault of the DAW vendors in not recognising Synopsos /security settings. But no, now that the update is installed, all works as it should. eg: 1) Logic had problems in loading Steinberg VIs, the temporary fix was to open the eLicenser first & run in the background. 2) UA’s new DAW ‘Luna’ would not run any Steinberg plugs (no Synopsos showing for Luna in Security prefs at all); now opens all plugs as it should.