@Chiron scriba - its in the base product - select a book that has an EPUB or AZW3 and press 't', or add Edit Book to Toolbars/Menus via Preferences->Toolbars. The version in 1.48 is more than adequate for most corrective editing.
It can also be run standalone, its in the install folder as C:\Program Files\Calibre2\ebook-edit.exe or C:\Program Files (X86)\Calibre2\ebook-edit.exe
calibre is a lot more than a viewer, in fact that's one its 'secondary' features (although its better than many other Windows ereaders), most people prefer to read their books on ereaders phones and tablet.
BR
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