SMOKE_EXE: Undefined variable

Dear all,
I am installing SMOKE-v2.5 using the package containing the following files.

After I executed ./smoke_install.csh, I encountered the following problems:

then I tried invoking the Assigns file, it failed again.

#cd $SMK_HOME/subsys/smoke/assigns
#source ASSIGNS.nctox.cmaq.cb4p25_wtox.us12-nc
SMOKE_EXE: Undefined variable.

other information:
the compilers are intel-11.1 and gcc-4.4.7.
I’ve installed ioapi-3.2, ncview, etc.

I would appreciate it if you would take the time out of your busy schedule to check out my posts and give suggestions.
Best regards,

Hi, the currently released version of SMOKE is v4.9. We no longer support v2.5.

Please use a newer version.

Thanks for your reply.
Our PI requires us to use smoke-2.5, which he thinks is more stable than the new version.