You have links in
https://www.mobileread.com/forums/sho...d.php?t=164162
(the thread name is Firmware updates, dictionaries, fonts and third-party apps for Onyx Boox M92 but most things applies to i62HD too, aprt from formware of course)
They are StarDic format dictionaries as those found in
http://abloz.com/huzheng/stardict-dic/