The API isn't working for me

the new one is not a C# .dll which you can reference.
there's a new example project, but i will save you the download:

first, make sure your project is set to `x64` instead of `Any CPU`. this is because Roblox switched to 64-bit in the recent years.
next, you have to put the exploit api .dll file in your app's `bin\x64\Release` folder
^ or embed it as a resource which gets copied to the build folder

then, inside your code, use these lines from the example to declare the functions:
(pastebin link because the wrd blacklisted word filter false-detects bad words inside this code)

https://pastebin.com/N76MhG57

you want to call `initialize()` before you call any function from the api, this is a basic winforms snippet:

 public Form1()
 {
     InitializeComponent();
     initialize();
 }

after initializing, run `execute(script)` to execute your script: (this is from the official example)

   private void btnExecute_Click(object sender, EventArgs e)
   {
       string script = txtScript.Text;
       execute(script);
   }

and to check if the exploit is attached currently, they recommend having a timer which calls `isAttached` periodically: (this is also from the official example)

        private void timerAttachChecker_Tick(object sender, EventArgs e)
        {
            bool attached = isAttached();
            if (attached)
            {
                labelStatus.Text = "Status: Attached";
                labelStatus.ForeColor = Color.Green;
            }
            else
            {
                labelStatus.Text = "Status: Not attached";
                labelStatus.ForeColor = Color.Red;
            }
        }

You can look at the example project in exploit dll download link and copy across all code for the attach,execute and isAttached. The code is practically just dllimports.

@Kxhu also has a cool project which will help you out a lot. You can check it out by viewing this thread. https://forum.wearedevs.net/t/37362