I'd love a copy of this too, remember watching it when i was quite young.
I'm not sure but i think this is one of the first exorcism movies i ever watched,which is why i'm quite nostalgic about it.
I think the order i watched the actual genuine Exorcist films was-
exorcist 2,then 3 and finally 1 on a bootleg before it was released on dvd/vhs.
Which is weird because most franchised if u see them in order get progressively worse.
My exorcist experience is they kept getting better.
Obviously the newer prequels ruined all that.