To explain further: I ask if you're specifically looking for a compiler because some people think that the only way to run any code is with a compiler, or that specific languages require one. Absent a specific thing in a spec ("an implementation of AwesomeLanguage requires compilation or it can't be called AwesomeLanguage"), languages can be interpreted or compiled.
So if you're interested in compilers, and want to see one for Arc, that's fine. But the default way of running Arc is not with a compiler. If you just want to run Arc, follow the instructions above.