Both output console error and wrap custom message

.npm/postinstall.js

@@ -68,8 +68,9 @@ async function downloadBinary() {
  try {
  await dl.start()
  } catch(e) {
- console.error(`Failed to download ${fileName} while fetching ${downloadURL}`)
- throw e
+ const message = `Failed to download ${fileName}: ${e.message} while fetching ${downloadURL}`
+ console.error(message)
+ throw new Error(message)
  }
  return path.join(binDir, fileName)
 }