It is already patched to 1.21. Here is the error it outputs just before the crash
execing config.cfg
couldn't exec autoexec.cfg
======== Hexen II Initialized =========
Loaded progs.dat, v6, 26905 crc, H2MP/v1.12 structures
Read in 562 str
FATAL ERROR: Mod_LoadModel: models/stltng2.mdl not...