Replication of Gertler & Karadi (2013)

I am not familiar with using Dynare at all.
However, as part of my masters thesis I am supposed to replicate the DSGE model from Gertler&Karadi(2013). I am going to conduct simulations of government bond purchases changing the parameter theta (Financial Frictions) to different values than 0.345 as it is given as in the model. For example I want to see the effect on the real variables when theta is 0.5.
Is anyone able to send me the codes for such a simulation?