Although I think you really shouldn't, some users still use the "Minimal Extropy Theme" I created 10 years ago on DNN9.
As fixing the errors is not that difficult, I fixed the DNN9 errors.
But you should realize that the skin is not HTML5, not responsive and partly uses tables for layout.
You should really move your site to a more modern Theme IMO, on the other hand not upgrading DNN is worse than not switching to a more modern skin.
If you want to stay with Minimal Extropy on DNN9 for a bit longer:
Nick kalyani came up with the name and an setup for of the design, I don't remember the background of the name any more TBH
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