To download and set up LuaJIT, follow these steps:

1.  Go to the official LuaJIT website ([http://luajit.org/download.html](http://luajit.org/download.html)) and select the appropriate version for your system (Windows, Mac, or Linux).
    
2.  Download the LuaJIT source code and unpack it to a directory of your choice.
    
3.  Open a terminal or command prompt and navigate to the directory where you unpacked LuaJIT.
    
4.  Run the following command to compile and install LuaJIT:
    

```
make && make install

```

5.  If the installation was successful, you should now be able to run LuaJIT by typing `luajit` in your terminal or command prompt.
    
6.  To make sure that LuaJIT is working, you can try running a simple Lua script. Create a file called `hello.lua` and add the following code to it:
    

```
print("Hello, LuaJIT!")

```

7.  Run the script by typing the following command in your terminal or command prompt:

```
Copy codeluajit hello.lua

```

You should see the output `Hello, LuaJIT!` if everything is set up correctly.
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