I have some important questions to ask and I would like answers from those who are more experienced.
I purchased a new PC with the following requirements :

Core i7-8550U
8,00 GB
operating system 64

1 - Can I install sims 2 with all the expansions or does it cause me problems and slow down my PC?
2- Downloading dowloads for the sims (sometimes more than 10 thousand files) risk creating problems at the PC?

Thank you for your answers

Its really not about those specs but what video card you have.
Those specs can run Sims 2 but without knowing what your video card is we can not tell you.

1. Yes, you can. I believe you will need the 4 GB patch and a graphics rule adjustment, because the computer has more memory than Sims 2 ever anticipated being available to it, and is also likely to have a more powerful video card than anyone at EA/Maxis imagined would be played with it. The Sims is 15 years old this year (if The Sims 2 was a Sim in the vanilla game with aging on, it would now be a teenager) and these elements are essential to ensure your speedy computer doesn't confuse the game.

ETA after seeing marka93's response: if you don't have a dedicated video card, then that is the one thing that could cause a problem. In the case of laptops, it's been known to fry out entire computers (both after a few brief hours, and long-term over many months), but even a desktop with an inadequete video element can cause significant damage. If you have no dedicated video card, or you've any doubts about the card you have, I would recommend running the game with just the graphics rules and 4 GB patch (no other mods) and see if it shows any hesitation when setting the stove on fire, or if the temperature increases in the case when running the game for a few hours (at least 1 more hour than you ever plan to run it in anger). In either of those things happens, get yourself a video card before trying again (and if you can't because, for example, it's a laptop, then get a different computer for The Sims 2, despite all that processing power and RAM). Even if it is solid as a rock and keeps its cool completely during all this, run the same checks after any substantial increase in custom content/"mod load".

2. Depends what else is on your hard drive. I would advise having a decent amount of space (50-100 GB) free at all times. If your computer still has a non-solid-state hard drive (unlikely if it had those specifications), defragment it every six months. If the hard drive is solid state, just make sure the 50+ GB of free space is there, and experiment with how much time you can tolerate the game taking to load (this is the biggest thing affected by the size and number of mods in the game).

(Note: I would recommend the hard drive is solid-state if possible - a fast read speed is helpful for loading things in the Sims relatively quickly, especially when there is a heavy mod load).

Welcome and have fun!

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@ieta_cassiopeia:
Thanks for the answer.
I do not know if I gave the right link to the video card, in case excuse me

The possibility of an old game causing a modern card/computer to overheat is pretty remote, and that's really the only way it can be damaged in my experience, because if the computer starts to get too hot nowadays, it will automatically shut down and won't boot normally if the fan is not working to protect it. If the computer gets hot when playing, you could just point an extra fan at it to keep it cool. Your card is probably ok, but how well it works will probably depend how much memory it has.

Your original questions sound as if you are concerned about the PC, rather than the game. The game may or may not run properly, but it's not going to slow your computer down for other things when it's not running, unless you maybe fill up the hard drive so it doesn't have enough space, but then you'd just delete some things to allow more space. Downloading things, there's always a risk that you'll pick up some malware or something, but I've never had that happen from Sims stuff and this site is particularly safe to download from, so I wouldn't worry about that either. You should have decent virus/malware protection either way. Most of us have well over 10,000 files in downloads, so I wouldn't worry about that either. It's not hard to get that many. I'd recommend you just try and we'll help you if you have problems getting it set up.

Thank you so much. I apologize for asking stupid questions. With the old PC I never managed to play The sims, it always gave me problems and sometimes it didn't even restart and I let it go. The PC was old, I admit, but it always held up until I started installing the custom material.

Now that I've bought a new PC for work, I hope I've made a good purchase to play a game that I love very much and that I would like to play.

That is a renamed GeForce 940MX and is about a mid range laptop video system just keep a watch on or watch out for overheating and make sure your game is using the GeForce card and not the on board intel video system.

There is no need to apologize. Your questions are not stupid. If you don't ask questions, how will you learn about these things?

You are asking in the wrong section. There is a help board and a technical board.

Sims 2 help board: http://modthesims.info/forumdisplay.php?f=31

Technical board: http://modthesims.info/forumdisplay.php?f=563

The tech board is quite hard to find unless you know about it.

I've experienced that system fail once on one of my computers, leading to it being a near-total write-off through long-term heat damage, though I will admit that was 13 years ago, which is a very long time ago in computing. I can believe temperature sensors and control systems are 1000% better in 2019 (and this sounds like a very solid laptop under discussion).