After installing Windows, first install DirectX and newest redist.
DirectX: https://www.microsoft.com/en-us/download/details.aspx?id=35
Redist: https://aka.ms/vs/17/release/vc_redist.x64.exe
Also, manually install your Graphics Cards drivers, because Windows can download some drivers that might not work properly.

you need to visit sheik server's appeal page to appeal the ban. plutonium is not responsible for the bans that dedicated servers hand out.

T0ony no plans, because as hinder has explained, there will be lots of time going through the reverse-engineer process, there's high possibility of C&D note (because it's still supported by Activision), because the game has everything that Plutonium offers, and lots more.
Instead of posting the same thread, you can search for BO3 threads, and in 100% of the time, the answer is no.
Maybe in the far future, but maybe.

Dillfeeds what's your antivirus?

Peo3354 Could you try repairing the game files? That could be the issue.

There's no Black Ops 3 client, nor there is someone that's planning on making one. It's still supported by Activision and it could lead to Plutonium being shut down.

kmsea It could be the mod that's causing your issue, or some custom maps.
Could you try playing on servers that have playerbase that plays on there, and to let us know if the issue still persists?

What method you used for downloading the game (sorry for late reply)?

@VVXGANG What's the username on your PC? You got adequate hardware to run Plutonium?

I3A Yeah, something like that. It would be quite interesting. Or, make it rotate guns on every 45 seconds, whatever you like.

Interesting.
It can be that you got special characters in your PC name (such as š, ć, đ, č, ž, and adequate characters in other languages (in your case, it's French)) or that your Windows lacks updates.
If you're missing DLL's, download redist https://aka.ms/vs/17/release/vc_redist.x64.exe and DirectX https://www.microsoft.com/en-us/download/35.

Dss0 Reason why we can't read it is because it's in Hebrew. As far as I know, I know nothing about Hebrew. But from the GUI, I know that this is Avast.
bajokitch add Plutonium folder to exceptions, and avoid having any unsupported characters in your PC username, else you won't be able to get Plutonium running, as it is stored in %localappdata%. Characters like ш, š, and so on aren't supported.

Your brother could be cheating on that PC, and when you signed in, you got banned for 14 days. Do not make more accounts, else your ban will be prolonged.

I3A you can try adding some interesting mods that community would like to see, or make it stock infected with SMGs and Shotgun rotations.

If you have access to any VPN, use those. Sure, your latency in game might be horrible, but it's at least worth a try.

jagamer453 Try signing in with mail instead.

Got any other AV's?
If you got just defender, I'd advise you to add the following folder to exclusions:
C:\Users[Your Username]\AppData\Local\Plutonium
Guide for any other antivirus is here: https://plutonium.pw/docs/antivirus/

Christonic You can try fully reinstalling Plutonium, or, if you feel like it, fully reinstall Windows. With fresh copy of Windows, you can get fresh Plutonium files.

Nice try.

Sneaky3s hardly that you can apply for staff on Pluto because it takes lots of time, resources and mental preparation to be one. You can help people even without staff role.