Finally, I created one, no, two scripts (hybrid or mixed, something between CMD and PowerShell, I don't know the exact term) to download, save, and install languages from the Microsoft Store.
The first (and second) scripts handle the download and backup operations (this is essential beforehand for the backup, as the files are immediately deleted after installation), followed by the installation itself. They then allow you to configure the newly downloaded language by default and use it immediately, using the "default" MS option (or not, and simply add it to the Windows Explorer language list). I haven't fully tested them all yet (far from it, only the second or third script are complete, and I hadn't yet determined the exact timing for when I needed to perform this backup, so I haven't had time to check the size of languages like "it-it de-de pt-pt," which were fully installed), and I'm too busy at the moment to perform complete tests on a virtual machine.
So, ultimately, asking the question almost gave me the answer.
"But," because it's often the case, this famous vi-vn language that I'm looking for my knowledge and not for myself, only downloads "15.5 MB," and I haven't checked if it's the same as the ones that are "already" in FOD 11 (incomplete) (and yet another script to install from this one, FOD 11 (24H2/25H2) - (10 1809/2004 (x86/x64)) (but that seems rather sm without all). Furthermore, it's more of a challenge I've set for myself than anything else (I've been doing it anyway, for a few years now, "without"). So, obviously, could someone inform me about what I have (or am missing (even better) in the end?)
Not forgetting, of course, (yet another script), the one for the Uninstalling one or more languages at once.
And to top it all off and make things easier for me (the ultimate goal, after efficiency), they are "all" in "multi-colored" displays in the command prompt for accents (fr-fr only) (which, via Windows 10 or 11, doesn't accept accents, a "known bug in 11") ("2 folders" of scripts "accents/or not/per master script") and also, without forgetting those of PS, which also have different colored messages during "connection/download/success or failure" (these, however, I didn't include accents in, to avoid any bug that could occur, if I work on a PC other than ("fr-fr" or "en-us"), .ps1, which are also the actors in the download, my primary goal of this silly challenge. And to be completely honest, I'm fed up !!!
There, I think I haven't forgotten anything.
Phew, that's finally it for the very precise and complete "current" information! I love it !
So, I thank in advance all those who have taken the time to read this post to the end, and who would be willing to give me information on this subject.
Just for Fun

Koko.
*Special Thanks
Garlin,
I sincerely thank you for the help your invaluable scripts provided, your immediate assistance, and especially your incredibly precise and targeted advice, outlining the possibilities of each approach and the limitations that initially guided me, ultimately leading me to the best techniques to achieve my goal in the fastest possible way, given the complexity of my project. Thanks to this, I saved an enormous amount of time in reaching my primary objective.
Which may have been achieved, to be confirmed after full testing.
(You can see this in the (very long) summary above.)
Well, I couldn't leave without addressing this little paragraph, which is especially dedicated to you, Garlin, to whom it may concern!
This is what "normal" people do when they know how to recognize the help they've received, without which this project could not have succeeded, or would have taken much longer to, first, reflect on it, find a hypothesis, a path, a solution, and organize this idea properly in their mind (even write it down, and by moving all these elements around, in one direction, then the other, below, above, in front, behind, more or less far, etc.), synchronize it very precisely, and finally find a coherent meaning, only then can they begin to test it. So those who shrug their shoulders, high and proud, claiming to be To be "alone" and "unique" creator and director of such a meticulous and precise project as mine.
Let's enjoy it, Garlin, these are our few seconds, a few minutes, of glory for "The Two of Us," not for me alone, NO!
And let's enjoy it!
Because we know that glory, like physical beauty, is fleeting. And it never lasts long in our minds before we move on to something else.
On the other hand, you men or women or whatever, who will read this post, and claim to be the "sole" creator and director, "unique" and without equal, when it comes to solving puzzles that few people have decided to tackle, a task seen by most as crazy and so achievable (everything is in computing), but with such a huge waste of time that in the end, it's not even worth it. to take an interest in it.
"Hats off!"
You truly are the "Greatest," "Master Kings," "Immense," "Gigantic," "Monstrous," "Unattainable" in your field, it's "Undeniable," "Incontestable," and "Irrefutable"!!!
"Only truly good copies make us see the ridiculousness of the original."
« Il n'y a que les vraies bonnes copies qui nous font voir le ridicule de l'original. »
— La Rochefoucauld, 1665