Can anyone tell me why I can't get anything more than demo tabs? I paid my subscription, It shows I have 11+ months left, I am logged in but still whenever click on a tab, I can only see the first few bars.

I'm guessing you're talking about PowerTab and GuitarPro tabs. You can view them either by buying PowerTab/GuitarPro (which nobody does), or by downloading TuxGuitar for free (which everybody does).

TuxGuitar will open PowerTab .ptb and GuitarPro .gpx files.