Web distribution of exported files

The book is exported by clicking export option in the admin.

But I have made new edit and changes to the book and I forgot to export the book from the admin.

When the user download, which copy of the version do they get, Will they get to download the book with the new changes which I have made or the copy which I clicked during the export.

I think they will receive the old version, if you do not export again, but is easy, Open the book you can download and try to find the updates

They get the latest exported files.

Can the export file generated when the user click on the front end and type of the file…example, if the user wants .epup file, when he clicks, the latest content is generated and downloaded…

No, you have to export manually.