Lookup Engines not available

I needed to reinstall Zotero and now the Lookup Engines are not available:
https://s3.amazonaws.com/zotero.org/images/forums/u11878596/exu29dncsd2l2t488kxg.png
I replaced the engines.json file with the one on https://github.com/bwiernik/zotero-tools, and they seem activated:
https://s3.amazonaws.com/zotero.org/images/forums/u11878596/yfpkcao97n3aq2mifjgq.png
But they still seem to be unavailable. Am I doing something wrong?
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