@Grzesiek2010 is right that it's not a common thing to do but you can in fact get the version number from within the form using an XPath expression that will look like /<form-name>/@version
. See an example at https://docs.google.com/spreadsheets/d/1fJMjg9J7xAAaRQwSDQ4J8TlYp8fzHDBtXnPd4QMfy5Y/edit#gid=0
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