Thank you, this is fixed and I have sent it to Dugi.
Please find attached the file so you can use it, however, this will be added in the next update.
Ensure the game is not running.
Extract it to the desktop then copy 61_64_Zangarmarsh.lua and then paste it to your install path. “pathWorld of Warcraft_classic_InterfaceAddOnsDugisGuideViewerZDugisGuide_BC_Leveling_H” Overwrite if it prompts.