The program needs CHDMAN.exe in the same directory as namDHC.exe to run - Currently only versions "0.236", "0.237", "0.238", "0.239", "0.240", "0.249" are supported ...
Pick your desired 32-bit or 64-bit version for download. Unzip and copy over the Scintilla.dll from the unzipped folder into the same folder as the script. You can of course place the DLL anywhere, ...