Here’s how to receive your bonus items

Here’s how to receive your bonus items : Here
1. Start the game.
2. Load your save, or start a new game.
3. Open the Options menu.
4. Select “Gameplay” tab.
5. Scroll down to the end and under “Redeem Code” type: 15gpr0sc03s
6. Click “X” button and then click “Triangle” button. In a few seconds u should see this “: )” in the same field, it will mean that items are activated.

You can find Kael’s Axe, the Fire Horn, and the Bardic Brian Skin & Booty in the Adventure’s Guild.
The Red Boots are in Skara Brae Underground, near the Grand Plaza, on a corpse inside a cage.

Likewise, the Bardic Brian Skin is available to all players. To use it, create a custom character and select Bard as your archetype.
You’ll have Brian as one of the Bard portrait options.

The Lute of Compulsory Cavorting is a special crowdfunded unlock that is in the game for everyone, no codes or unlocks required.
The lute is available via vendors, victory drops, and in a crate across from the Adventurer’s Guild in Skara Brae Underground (but requires solving a puzzle to get to).

THIS IS OFFLINE CODE AS I’VE TESTED, LIKE CHEATS IN GAME.

Items Info & localization:
https://www.en.magicgameworld.com/the-bards-tale-iv-registering-dlc-and-in-game-locations/

Enjoy

By @Arczi