Reporting errors on web site

Hello,

I could not find a contact for the webmaster or an appropriate forum thread, so here it goes:

on https://winscp.net/eng/docs/history , is the date (2016-07-20) for V.5.10 in error?

No. It means that the last change to a future 5.10 code branch was made on 2016-07-20. The 5.10 was not released yet, as the entry says.