Hello, friend!
You can try the following steps:
1. Download the Hedex file.
2. Change the file name extension from .dex to .zip.
3. Decompress the xxx.zip package to obtain the resource folder and profile.xml.
4. Place the resource folder in a path that contains only English.
5. Open the FAR HTML tool, click Add File, and select the resource folder from the Folder drop-down list.
6. Click Wizard and continue to Next until you are finished. The CHM file is generated in the resource file.
Hope this can help you!