autoupdater.quitAndInstall don't relaunch and update success

• electron-builder: 20.28.4

• electron-updater: 3.1.2

• Target: Mac

click Restart now can relaunch because of app.relaunch();app.exit(), but cant update from the downloaded update file. Then will launch app and show dialog again and so on, repeated cycle. @develar @maczikasz, thx.

index = dialog.showMessageBox({
          type: 'info',
          buttons: ['Restart now', 'later'],
          title: 'Updates downloaded',
          message: Message.downloaded + meta.version,
          detail: meta.readme,
        });
        if (index === 0) {
          try {
            autoUpdater.quitAndInstall();
            setTimeout(() => {
              app.relaunch();
              app.exit(0);
            }, 6000);
          } catch (e) {
            dialog.showErrorBox('Error', 'Failed to install updates');
          }
        }
      } else {
        delFile(pkgCacheDir);
        dialog.showMessageBox({
          type: 'warning',
          buttons: ['OK'],
          title: 'Updates downloaded fail',
          message: global.localizedStrings.pkgSignFailMessage,
          detail: global.localizedStrings.pkgSignFailDetail,
        });
      }

Error:

[2018-10-19 00:02:55:0774] [error] Error: Error: No update available, can't quit and install
    at MacUpdater.quitAndInstall (/Users/cuitfanshide/Documents/Projects/7-dragon-ball-wallet-2c/dist/mac/WOOKONG Solo.app/Contents/Resources/app/node_modules/electron-updater/src/MacUpdater.ts:149:24)
    at /Users/cuitfanshide/Documents/Projects/7-dragon-ball-wallet-2c/dist/mac/WOOKONG Solo.app/Contents/Resources/app/dist/main.js:910:43
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:109:7)