If you don't want to use MathJax, you can use the Equation Editor and FMath Editor plugins. Just include it in the build, download and extract and no need for extra configurations.
WIRIS doesn't work. Do not include the MathEx plugin because it will make your editor disappear.
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If you have a question about Q2A, please ask here, in English.
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April 20, 2021: Q2A 1.8.6 released!