It seems matGeom's normalize.m is superseded by normalizeVector.m.
I cannot find any use of normalize.m in matGeom's code.
I have removed the offending function form Octave's matGeom repository and will submit an issue to matGeom as soon as I can log in to github again.

I think the error in comment #0 and comment #3 are the same.
matgeom is a dependency of geometry which in turn is a dependency of mapping, so loading the mapping package will in turn load the matgeom package as well. And the first time the latter is loaded, the check on verLessThan.m will run.

Leaving aside that the way the matgeom package deals with shadowing verLessThan.m is a bit fragile at best, another way to circumvent this issue is to patch the matgeom package in the Windows installers (mxe-octave). When those installers are built, the Octave version is obviously known and consequently, it is known if verLessThan.m is in core Octave and if so, will be shadowed by matgeom.
I'd prefer a change in the matgeom package but until that happens, patching mxe-octave may be easier.

Found out was just a simple issue with the security properties of the GNU Octave folder.  I changed these to include Full Control, Modify, and Write.  Executed 'pkg load mapping' without the issue I posted about earlier.  Tested by executing 'help shaperead' and the help text displayed.

verLessThan.m merely does the same as the core Octave function.
As the OP shows the matgeom package neatly renames the verLessThan.m function out of the way, as intended.

However, matgeom's normalize.m (in the geom2d/ subdir) works quite differently than core Octave's one and AFAICS is meant to be used in different situations. I expect that suppose sooner or later errors will occur, mostly if functions from the matgeom package and core Octave's statistics functions will be used together. I don't know of such situations in the wild.

FWIW, in my own local copies of the matgeom package I've renamed normalize.m to normalizeLine2d.m just to be sure, but that's just a local and private solution.
An underlying issue is that the matgeom package is merely a repackaging for Octave of the external Matlab matgeom toolbox (see here: https://github.com/mattools/matGeom?search=1). Unfortunately that toolbox itself shadows Matlab's own 'normalize.m' function. I suppose an upstream bug report mentioning this with that matgeom toobox might be due.

Anyway this sort of issues is to be expected, a.o. due to lack of a namespace mechanism in the Octave (Matlab) language and the ever growing number of functions for Octave (and Matlab) supplied through ever more packages ...

@OP (starry):
As to

> I want this problem solved soon.

Sure, we understand, but Octave is a volunteer project. We may take nudges but no orders. For now I interpret your wish as a nudge, though :-)
If you want it to be solved 'soon' you can -in the spirit of Open Source- also take action yourself, e.g., by submitting that bug report upstream with the matgeom toolbox for Matlab (see https://github.com/mattools/matGeom/issues). So there, I've voluntarily already sorted out some things for you ;-)

I tried to load matgeom package by typing "pkg load matgeom" and
got the following warning and error message:

=================================================================

>> pkg load matgeom

warning: function C:\Program Files\GNU Octave\Octave-8.3.0\mingw64\share\octav
e\packages\matgeom-1.2.3\verLessThan.m shadows a core library function
warning: called from
    load_packages_and_dependencies at line 56 column 5
    load_packages at line 53 column 3
    pkg at line 639 column 7

warning: Permanently renaming verLessThan.m since it is already present
warning: called from
    _matgeom_package_register_ at line 41 column 9
    C:\Program Files\GNU Octave\Octave-8.3.0\mingw64\share\octave\packages\mat
geom-1.2.3\PKG_ADD at line 1 column 1
    load_packages_and_dependencies at line 56 column 5
    load_packages at line 53 column 3
    pkg at line 639 column 7

warning: function C:\Program Files\GNU Octave\Octave-8.3.0\mingw64\share\octav
e\packages\matgeom-1.2.3\geom2d\normalize.m shadows a core library function
warning: called from
    _matgeom_package_register_ at line 49 column 5
    C:\Program Files\GNU Octave\Octave-8.3.0\mingw64\share\octave\packages\mat
geom-1.2.3\PKG_ADD at line 1 column 1
    load_packages_and_dependencies at line 56 column 5
    load_packages at line 53 column 3
    pkg at line 639 column 7

================================================================
Hence, matgeom's functions do not run. I want this problem solved soon.

Thanks