Depends.. how far is it to drive it to a place of repair? Because driving it around any further than that isn't safe, in fact it isn't really safe to do that particularly if you're already smelling burning. Without knowing precisely what is being burnt it's impossible to say whether what is being burned away is something the car needs to function or not. In addition to the obvious safety concerns that accompany burning - fires, sudden failure of important components while in motion that sort of thing, you should also be concerned about what you can't smell!
It's probably worth having a good look and making sure nothing is touching the manifold that shouldn't be after it was replaced/repaired from the previous leaks, as this could be an explanation for the burning smells.
If these weren't addressed back then, well I think it's a pretty sure bet that any time you could have borrowed to live on back then is well and truly exhausted. Cracks/rust sufficient to cause multiple leaks nearly two years ago are only going to have gotten significantly worse in the intervening time. It won't be safe to drive around on, it won't be legal to drive around on and it should not be driven around on.