Help file tallyerp9ref.chm is not available

Hello,
While trying to access Help file from Tally I had this error. I made a full install of the program and it seems like something is missing. I tried to download the file and is now working, nothing happens when I click Yes for download. Any solution for this error ? Why my Help file is missing ?
Thank you !

Help file (tallyerp9ref.chm) is not available.
Do you want to download it?
Yes or No
