Microsoft Office 2010 language pack proofing tool without changing UI

Hi

I may have misunderstood the literature regarding the language packs or language proofing tools. 1st of all I am not sure if they are the different names for the same thing or not. Are they? 2nd I do not in ay way want to change my UI with a different language. All I want to be able to do is -1- let Office not give me those squiggly red lines when I write in a different language -2- be able to spell-check and grammar check in the other language. And since I often use more than one language at the same time (2 to 3) be able to use all of the languages for spell-check etc. at the same time. So what exactly am I looking for?

What I have legally downloaded are 3 files that have such a series of numbers/letters: X16-37717.exe, X16-37707.exe， X16-37690.exe. Are these the right kind of stuff I am looking for?

Thanks

Thanks for your reply. What I am referring to I do not think installs multiple languages. By this I mean, you wrote, "UIs in different languages will also be installed" What I downloaded comes in individual languages. Only French, only Spanish, Only Chinese Traditional. SO, if you don't mind me asking how would these, if installed individually also do this: "UIs in different languages will also be installed" ? I'm assuming perhaps that we are not speaking of the same thing (see how ignorant I am?)
Where I went is here: Office 2010 Language Packs Free Official Direct Download Links « My Digital Life
it is here that it says it's legal. And what they also wrote is: "Office 2010 language packs are add-in products that enable multiple language and show localized Menus/Display, Help, dictionary, and include localized language document proofing tools such as thesaurus, spelling checkers, grammar and style checkers, hypenators, AutoCorrect lists"

What confused me is another site, in speaking of the same thing and same file wrote, "Office 2010 language packs allow you change the language used for text in menus, dialog boxes and toolbars"

In my case I absolutely do NOT want to change text in menus, dialog boxes etc.
All I want is their dictionary, thesaurus, spell checker.
Hence my question would be, if I install this pack will it automatically install evrything else? It appears to me, based on the installation instructions, that there is no way of controlling what you do want and what you don't. For on this other page it says,
1. Download Office 2010 language pack from here.
2. Double-click on the downloaded file and click continue for the UAC prompt.
3. Select Microsoft Office 2010language pack from the list and click Continue
button to see the license agreement screen
4. Accept the license agreement, click Continue.
5. In the following screen, you can choose between custom or direct install methods...
6. Installation may take a few minutes. Once done, you will see successfully installed message.

The above is supported with images. As you can see, there is no place to choose what is wanted and what is not. Hence my worries.
Your opinion or thoughts would be greatly appreciated.

Thanks for your info. Also thank you for letting me know about mydigitallife. I was not aware of their reputation and no I am not interested in getting the language packs illegally, so thanks on that count as well. I assumed that since they were offered in many places for free, just like the other site I wrote about, I thought maybe there was truth there. I was wrong, thanks.

Finally I did notice (Y didn't i b4???) that some languages are in my Word (Office Professional Plus 2010 ver. 14 (32bit)
However, if I write on those languages that are already there it will have the red squiggly lines, as if they're spelled wrong and I know they are not, so why would it do so? Oops, should I be asking this question in another post? If so sorry.