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Before I installed the TermExtractor (aka Sdl.Community.Excel.Terminology, which is confusing), Studio 2019 started alright (with about half a dozen other plugins installed). After I installed it, Studio gets stuck at Initializing Views and nothing more happens.
I also discovered that I could "uninstall" it by simply deleting it from the Unpacked and Packages folders in the SDL\SDL Trados Studio\Plugins folder. That is good to know.
But I would like to be able to use it.
I should add that after deleting the TermExtractor files as described, I also had to delete or rename the UserSettings, BaseSettings and Plugincache files in the 220.127.116.11 folder.