Is there anywhere to buy this on PDF, just want to download it on to my tablet.

Long story short: there are no purchasable PDFs of the Star Wars RPG, due to complex business contract reasons. The only PDFs you can get your hands on are the Beginner Game sequel adventures for all three lines, sheets, errata and Under a Black Sun , which are all free.

Let's not get into the umpteenth discussion on PDFs again, guys...

What you could do is buy it yourself, scan it and then print it as a PDF for your own use.