These version numbers are historical accidents and not relevant today.
Ref: https://lists.gnu.org/r/emacs-devel/2020-03/msg00080.html
* lisp/calendar/icalendar.el:
* lisp/emacs-lisp/checkdoc.el:
* lisp/hippie-exp.el:
* lisp/linum.el:
* lisp/master.el:
* lisp/progmodes/cwarn.el:
* lisp/repeat.el:
* lisp/ruler-mode.el:
* lisp/textmodes/remember.el:
* lisp/wdired.el:
* lisp/woman.el: Change "Version" header to "Old-Version".
;; Created: August 2002
;; Keywords: calendar
;; Human-Keywords: calendar, diary, iCalendar, vCalendar
-;; Version: 0.19
+;; Old-Version: 0.19
;; This file is part of GNU Emacs.
;; Copyright (C) 1997-1998, 2001-2020 Free Software Foundation, Inc.
;; Author: Eric M. Ludlam <zappo@gnu.org>
-;; Version: 0.6.2
+;; Old-Version: 0.6.2
;; Keywords: docs, maint, lisp
;; This file is part of GNU Emacs.
;; Author: Anders Holst <aho@sans.kth.se>
;; Maintainer: emacs-devel@gnu.org
-;; Version: 1.6
+;; Old-Version: 1.6
;; Keywords: abbrev convenience
;; This file is part of GNU Emacs.
;; Author: Markus Triska <markus.triska@gmx.at>
;; Maintainer: emacs-devel@gnu.org
;; Keywords: convenience
-;; Version: 0.9x
+;; Old-Version: 0.9x
;; This file is part of GNU Emacs.
;; Copyright (C) 1999-2020 Free Software Foundation, Inc.
;; Author: Alex Schroeder <alex@gnu.org>
-;; Version: 1.0.2
+;; Old-Version: 1.0.2
;; Keywords: comm
;; This file is part of GNU Emacs.
;; Author: Anders Lindgren
;; Keywords: c, languages, faces
-;; Version: 1.3.1
+;; Old-Version: 1.3.1
;; This file is part of GNU Emacs.
;; Author: Will Mengarini <seldon@eskimo.com>
;; Created: Mo 02 Mar 98
-;; Version: 0.51
+;; Old-Version: 0.51
;; Keywords: convenience, vi, repeat
;; This file is part of GNU Emacs.
;; Author: David Ponce <david@dponce.com>
;; Created: 24 Mar 2001
-;; Version: 1.6
+;; Old-Version: 1.6
;; Keywords: convenience
;; This file is part of GNU Emacs.
;; Author: John Wiegley <johnw@gnu.org>
;; Maintainer: emacs-devel@gnu.org
;; Created: 29 Mar 1999
-;; Version: 2.0
+;; Old-Version: 2.0
;; Keywords: data memory todo pim
;; URL: http://gna.org/projects/remember-el/
;; Filename: wdired.el
;; Author: Juan León Lahoz García <juanleon1@gmail.com>
-;; Version: 2.0
+;; Old-Version: 2.0
;; Keywords: dired, environment, files, renaming
;; This file is part of GNU Emacs.
;; Maintainer: emacs-devel@gnu.org
;; Keywords: help, unix
;; Adapted-By: Eli Zaretskii <eliz@gnu.org>
-;; Version: 0.551
+;; Old-Version: 0.551
;; URL: http://centaur.maths.qmul.ac.uk/Emacs/WoMan/
;; This file is part of GNU Emacs.