The Kunena team has announce the arrival of Kunena 7.0.4 [K 7.0.4] in stable which is now available for download as a native Joomla extension for J! 5.4.x/6.0.x. This version addresses most of the issues that were discovered in K 6.2 / K 6.3 / K 6.4 and issues discovered during the last development stages of K 7.0
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I found it how to do it, and my it work on my site.
Just share with you in case ...:
Category images folder is "your_html_rootfolder/media/kunena/attachments/legacy/category_images/" or you can change on admin.
category images working with category id :
catid_notlogin.gif
catid_on.gif
catid_off.gif
for example : created root 1st parent category is Microsoft=12 (for me it's section) and child category is Applications id=32
your category id is "32" create
32_notlogin.gif
32_on.gif
32_off.gif
than upload your images on your category images folder. default config folder is :
"your_html_rootfolder/media/kunena/attachments/legacy/category_images/"
you may ask, what happen with 1st category root one id=12, I tried but it's don't work.
Still Investigating or may be i have to wait for the next release or a hack ...