Alternatively, if you're trying to open old .eddx files from v8.4, I can explain how to migrate them to modern software without losing data.
Which direction fits your situation?
(released around 2016–2017). The software has since been rebranded as Wondershare EdrawMax (now at version 12+ or 13+), with major UI/UX and feature changes. Edraw Max Pro 8.4