You must copy or symbolically link your MSC ( <your_steam_path>\steam\steamapps\common\Half-Life\msc ) install to the msc subfolder of this archive.
You must copy or symbolically link your Half-Life ( <your_steam_path>\steam\steamapps\common\Half-Life\valve ) install to the valve subfolder of this archive.

See:
https://www.msremake.com/threads/how-to-make-an-hlds-dedicated-server-for-ms-c.805/
For more information.