https://bugs.winehq.org/show_bug.cgi?id=30033
--- Comment #32 from Rosanne DiMesio dimesio@earthlink.net --- The workaround works here, too, for Pro Plus.
The line
<Display Level="none" CompletionNotice="no" SuppressModal="yes" AcceptEula="yes" />
isn't necessary; that just makes it a silent install, so you don't have to accept the EULA, etc., but doesn't affect activation (at least not on my system).