For example in Dementia, 1:04 min., there's only inscription (S killed C), armor and health status. I want set same in BTA demos
Most of the hud elements can be deactivated in the game menu. F12 for the BTA hud statistics.
If you want to want to remove the chat or console death messages incl. the beep alerts, look in UTGame\Config\UTGame.ini in MyDocuments for MessageBeep and DeathMessage or similar.
If you want to go deeper,
, edit utgame.int in the UT3 installation folder.
It is located in UTGame\Localization\INT (English language).
Make a backup and run the changed settings when needed.
As an advice, use an advanced editor to work methodically, i.e. easily finding and clearing the picked up ammo or weapon messages from the hud.