Because what you mentioned in your message is definitely not a feature of the original game, even with an HD mod:
"the unique abilities of creatures have changed, for example, minotaurs used to have the ability to block attacks, and ranged creatures had abilities like 1/2 or full damage in melee combat."
Ultimately, if you can't provide enough information, I can suggest the "Complete Collection" repack that I've had for 10 years and that best matches the original, except it doesn't require a disc. You can install the HD mod on it yourself. Just before deleting your version, transfer your saves and (possibly) added maps somewhere if you want to keep them.
(Василь Симоненко. Люди – прекрасні)