If you want to play Tribal Wars with your old saves, you should modify your "profile_n.seria" files in "Saves" folder.

The following code should be added in the section where a bunch of "m_biography=" are sitting.

m_biography=2147483651
{
m_classname=Biography
m_code=-2147483645
m_type=7
m_text=@{color=0}{scale=1.2} @{scale=1}{font=0}{max=170}{color=2868240014}You can change the game mode in the main menu.
m_param1=5
m_param2=-TRIBAL WARS-
}

Those "biography"s are kinda look similar to this code so you can find it easily by searching "biography".

AND add this thing right before "m_savoir="

m_scripts=16777219
{
=====================================
ID=600
NAME=STAND
=====================================
m_classname=Script_ID
m_code=16777219
m_master_id=0
m_level_id=63
m_state=0
m_param1=0
}

If both codes are properly added, the Tribal Wars will be run properly.

Tribal Wars correct work only with save what been created on version 1.0005. If you start it mode on transferred save from 1.0004, you seems only background(bug).
P.S If you want russian language in game, rename russian.seria(Steam\steamapps\common\Hammerfight\Data\Dialogs) file to english.seria(some inscriptions will be displayed incorrectly)

installed everything and already completed the game, but still couldn't find how to open this mode. However, the game is listed as version 1.0005. ¯\_(•—•)_/¯

Getting the same problem as @Edge Lord, sky, sun and clouds moving but nothing else for Tribal wars, created another save but same problem, do I need a fresh install?

it only works on a new save

Seconding the resolution issues. Before installing this, the game ran perfectly in fullscreen. After, and it runs in letterbox no matter what I change in the config file. What does Steam's outdated version have that this one doesn't?

Hi I tried installing it but when I click on the tribals war all i get is an empty sky, wind blown to my face (in-game) and nothing happening. Did I do something wrong?

why have I found this so late?!

Quick note to stop anyone from being discouraged too quickly if it doesn't immediately work, you need to extract the contents of the file "HF_05_Update" not just the zip or the file, otherwise you just get a folder in your Hammerfight folder that doesn't do anything

I installed the patch but it has affected the aspect ratio, now I'm forced to either play on a small window on my 1920x1080 monitor or play the game in fullscreen, but somehow squashed horizontally into a square.