Windows download is here. I cannot find a statically linked version (all-in-one). This is a good short tutorial on how to draw flowchart. Note how common node attributes can be declared together:

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digraph {
    label="How to make sure 'input' is valid";
 
    node[shape="box", style="rounded"]
       start; end;
    node[shape="parallelogram", style=""]
       message; input;
    node[shape="diamond", style=""]
       if_valid;
 
    start -> input;
    input -> if_valid;
    if_valid -> message[label="no"];
    if_valid -> end[label="yes"];
    message -> input;     
 
    {rank=same; message input}
}

On commandline, use:

dot -Tpng -o graph.png graph.dot

For newlines in labels, you can use \n. Alternatively, literal newlines in the string is captured and regarded. Further more, \ in strings are line continuation. So for better formatting, one can write:

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node[label="\
this is a long description
this is another line];

References