Upgrade error from Quartus 12.1 to Quartus 13.1

We have a legacy target design done using SOPC builder Quartus 12.1. When we try to upgrade it to QSYS in Quartus 13.1 we are getting an error (pic attached).

Is there any way we can get the Quartus 12.1 software ?

Is there any work around for the upgrade error we are seeing ?