Thanks for your report.

transfer option has been obsoleted (while still working) long time ago in favor of -transfer switch of transfer commands like get, put, etc.

Also binary mode is the default for long time.

So I have removed the command from the example.

an example in https://winscp.net/eng/docs/scripting has transfer binary but there is no such option in https://winscp.net/eng/docs/scriptcommand_option. Does transfer exist?