Hello Soham,
Since the neutron star collapse simulation uses a parfile distributed with the Einstein Toolkit release, I assume the thorns are available to the public. Is there any updated link for checking out the Zelmani arrangement thorns?
Zelmani itself is not in the public. However CartesianCoordinates is part of CTGamma (which is public and GPL) which you can download here:
git clone https://bitbucket.org/llamacode/ctgamma.git
or by adding this stanza to your thornlist:
!TARGET = $ARR !TYPE = git !URL = https://bitbucket.org/llamacode/ctgamma.git !REPO_PATH= $2 !CHECKOUT = CTGamma/CartesianCoordinates
Last time I tried it, the parfile was difficult to get to work though, unfortunately. You may have to play in particular with the method to reduce the pressure support initially.
Yours, Roland