You need a html server (local or not). If you don't know how to use one please watch a tutorial for it.
Once it's done you can execute in your web browser any of the class.html file.
Whisper me on discord or create a ticket on github
Whisper me on discord
Base by CraftedRO (https://github.com/CraftedRO/Offline-talent-calculator-for-WotLK-3.3.5a)
Adapted for Duskhaven by Illustre https://github.com/BelsethUwU/Duskhaven_TalentCalculator
Helped with Adaptation :