Trouble Running Future Simulation with RegCM 5 (Sept 2025, RCP4.5)

Hi all,

I'm trying to run a future climate simulation for September 2025 using RegCM version 5 and HadGEM2-ES RCP4.5 GCM data. My goal is to downscale this data over Southeast Asia, but I'm stuck at the preprocessing step. I modified the namelist, as so
[...]
 dattyp = 'HA_45',
 ssttyp = 'HA_45',
[...].

Can someone please share Step-by-step workflow to run RegCM5 with GCM future data.