Asynchronous function calls are simultaneous

Lines 12 to 14 in 9434dfe

    
           mkdir(to) 
        
               .then(download({ from, to })) 
        
               .then(install({ to }));

download() and install() both return a promise, but Promise.prototype.then should not be called with another promise as argument, it would expect an asynchronous function which return a promise.

So download() and install() are actually called simultaneously and the install might not work since the download is not yet complete.

	mkdir(to)
	.then(download({ from, to }))
	.then(install({ to }));