You can use option batch continue
https://winscp.net/eng/docs/scriptcommand_option#batch

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Additionally, you can vote for:
Issue 969 – Option to exclude files opened for writing

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Thanks for considering a donation.

Can't see a solution despite extensive searching.
OK, working from the command line, calling a script file to download a bunch of files. On some occasions, a file is found to be already open and so can't download/over-write. Fair rnought, that makes sense but when this happens, the entire FTP download aborts. Is there a work-around that cam be applied in the command (ie from command prompt) to ignore such errors?
Thanks for help – a seriously good product and if this wee issue can be sorted, I'll be using this app in earnest and chucking a pile of cash at it to keep it alive. Thanks, Owen