https://bugs.winehq.org/show_bug.cgi?id=50336
--- Comment #8 from James guest26118280@gmail.com --- (In reply to Zebediah Figura from comment #7)
If the command finishes and yields control back to the console, you need not do anything.
Otherwise, make sure all visible Wine programs are closed; if that doesn't work, I guess you could manually kill the server with `wineserver -k`.
I shut down everything except the terminal and went to bed. It was completed when I checked after waking up. When I tried the installer, it opened the log-in page. Seems the original installation was completed despite the error message. I am now in the game. Thank you for clarifying the problem and supplying an understandable solution.