Perform tobit maximum likelihood estimation

I am trying to run a Tobit Model and am running the code below

options = optimset('LargeScale','off','MaxFunEvals',10000,'Display','off');

try [estimator_big,log_like,exitflag,output,Gradient,Hessian] = fminunc(@(c)ML_TOBIT(c,lb,ub,X_lb,X_ub,Y_continous,X_continous,nreg,num_continous),c_initial,options);

catch disp(' ') disp('Oooopse, Matlab optimization toolbox is not installed, or it experienced an error.') disp('You may download a compatibility package on my website.') disp('http://www.public.iastate.edu/~hqi/toolkit') error('Program exits.')

end

I tried using the url to download the relevant but the page seems to be missing. Can someone tell me where can I download the relevant file. Thanks in advance