Deleting that for some reasons opened up a whole new can of issues, apparently from 2013 (specified for property ‘fernFlower’ does not exist). That seems to be most likely caused by a problem with my JRE and/or JDK installation, so I have to reinstall those at some point. So I can’t confirm if it would now have worked or not, as the new issues doesn’t allow to even get me to that point, sorry, but I now suspect that the issues are much more likely on my side.
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