Find a reputable source for the DLC unlocker tool. Ensure it's compatible with your version of Total War Warhammer 3.
Here is a factual breakdown of what you're asking for, the implications, and safer alternatives.
In that case, use the non-portable standard CreamAPI on a secondary, empty Windows partition with no personal data. Do not use a USB drive. Do not search for "portable." And never, ever connect to multiplayer.
Q: Will using a DLC Unlocker void my game warranty? A: Using a DLC Unlocker may void the game warranty, but it depends on the specific terms and conditions of the game.
In the gaming underground, the "DLC Unlocker" for Total War: Warhammer 3
Be aware that using a DLC unlocker might violate the terms of service of the game. This could potentially lead to account bans or other penalties.
Avoid the "portable DLC unlocker" rabbit hole. It promises a portable paradise but delivers a portable prison of malware, crashes, and account bans. Instead, invest in a 1TB external SSD, use Steam's offline sharing legitimately, or play the base game—which is still hundreds of hours of content.