I’m not sure if you have already figured it out, but I came across your issue while looking for an answer myself. Thought I would post here for anyone else who stumbles across this.
For me, I just had to go to Plugins > Plugin Manager > Show Plugin Manager, and then scrolled down to “DSpellCheck” and clicked “Install”. After a restart of Notepad++, it worked.
I also found another issue here that suggests moving DSpellCheck.dll from the “disabled” folder to the “plugins” folder in your Notepad++ installation directory.
Hope this helps! :)
