Theme not working – celestial aura

Hi,
I have used the theme celestial aura before and it is working on my other website, however it just stopped working on another website I am building, which I have been building for months!!!!!!
It just comes up with the first 10pixels at the top of the theme ( a little sliver) and everything else is blank. All other themes work and I even reinstalled theme which means I have lost all my work!!!!!!!!
However I want to still use that theme as it took me ages to learn how to adapt each little part.
I am at a loss!!!!!