You can access the latest version of HotA by following one of a number of interchangeable links. If you encounter problems with downloading, try another one:
https://www.vault.acidcave.net/download.php?id=614
https://heroes.chubr.cf/HotA_1.6.1_setup.exe
https://drive.google.com/file/d/1Z-Ui0GyAuQIomOQI7aBr-dHwy0kUZUl6/view?usp=sharing
https://mirrorace.com/m/3CO6q
https://www.mediafire.com/file/vrq4jvjxwt313dv/HotA_1.6.1_setup.exe/file
http://heroes3towns.com/HotA/HotA_1.6.1_setup.exe
http://h3hota.com/storage/HotA_1.6.1_setup.exe.torrent
It is recommended for torrent-client users to download updates using the torrent link. This will help to reduce server load.
HotA is to be installed on top of the previous HotA version or the original game “Heroes of Might and Magic III: Shadow of Death” or “Complete”. Localization of the original game does not matter.
Attention: HotA is not to be installed on top of “Heroes of Might and Magic III — HD Edition” (from Ubisoft), or on top of “Restoration of Erathia” or “Armageddon’s Blade” HoMM III versions.
You can purchase the original game “Heroes of Might and Magic III: Complete” for installing HotA here:
https://store.epicgames.com/en/p/might-and-magic-heroes-3
https://store.ubi.com/ru/heroes-of-might-and-magic-iii--complete/575ffd9ba3be1633568b4d8e.html
https://www.gog.com/game/heroes_of_might_and_magic_3_complete_edition
If there are issues when performing an automated update of the HD-Mod, you can download the up-to-date installer package from the developer’s website and install it over the old version in the same folder.