DeepL MT Error: Set property 'System.Windows.ResourceDictionary.Source' threw an exception.

Using 2021 SR2 - 16-2.8.9097 w/ licensed DeepL plugin

Adding DeepL MT Translation Provider to Project Translation Memories prompts:
Error: Set property 'System.Windows.ResourceDictionary.Source' threw an exception.

Reinstalling Sdl.Community.DeepLMTProvider.sdlplugin and replacing MtComparison.sdlplugin does not fix it.

Would very much appreciate help or direction to self-help. Thank you.

Wolfram

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