Here is simple plugin to customize 404 page on your Q2A site. Its FREE!
I have installed this plugin and working fine. I want add here, if someone wants all 404 pages to go to their home page then add this on html code -
<meta HTTP-EQUIV="REFRESH" content="0; url=http://www.yourdomain.com/">
See Demo Here
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May 7, 2020: Q2A 1.8.4 released!