Stop the server's work before launching a new version setup file: /KillServer
The installer key.
The installer checks if the process mcserv.exe is working, if yes forcibly stops its work before starting the process of installation for a new version.
When using this key you should understand the following:
there is no checking for which mcserv.exe process is deleted from the memory. If the computer runs several MyChat Servers the key /killserver is useless;
mcserv.exe unloads from the memory in emergency; all unsaved data is lost.
Example
mcserv-v6-8-0.exe /KillServer