HDFT Classic Demo 3 file

i'm having issue with the mod
if a zombie doctor tries to throw a scalpel to me, it gives me this error: "
Host_Error: PF_precache_model_I: 'models/scalpel.mdl' Precache can only be done in spawn functions"

Very good mod, the final boss was epic.

When i start a new game, it gives me an error:

Microsoft Visual C++ Runtime Library

Debug Assertion Failed!

Program:
...eam\steamapps\common\half-life\hdtfc_demo\cl_dIls\client.dIl
File: minkernel\crts\ucrt\src\appcrt\convert\isctype.cpp
Line: 36

Expression: c >= -1 && c <= 255

For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.

(Press Retry to debug the application)

I clicked "Retry", but that just crashed the game

So I downloaded this demo but when I load it in-game it comes up as "Demo 1" instead of Demo 3, not sure if that was an accident or if I downloaded the wrong file. Also when I get to the G-Man scene and walk past the windows with the security guard zombie dragging the dead scientist, then go through the door past the explosives crate and into the next room, I get booted to the main menu. I tried loading a save then doing it again and it consistently boots me to the menu at that section. Is that just the end of the demo or is it a bug?