
First of all, you need to have ORBIT DOWNLOADER.
If you don't have it yet (where've you been??), here's the link:
http://www.orbitdownloader.com/download.htmAfter installation, go to the playlist page that u want to download.
There's this Flash Player thingy above the playlist.

Open your Orbit. Click Tools, then click Grab++
And this window will pop-up.

Click the NEXT button on the Flash Player to get the subsequent songs.
Tick / choose the songs that you wanted, then click on the DOWNLOAD button.

Then this box will pop-up.

Choose the location where you want to save your files.
Click OK & your download will begin, then just wait for your download to finish.
That's it... =).
Thanks to
Schizinc for the solution. :D