The short answer is: technically, yes, but with major caveats.
Verdict: You can unlock DLC for single-player campaigns and AI skirmishes. For the 95% of the experience that is PvP multiplayer, a DLC unlocker is useless. Wargame Red Dragon Dlc Unlocker
Searching for a "free DLC unlocker" is a minefield. Here is what you are actually risking. The short answer is: technically, yes, but with
The use of DLC unlockers sparked heated debates within the community. The central question was: Does this constitute cheating? Verdict: You can unlock DLC for single-player campaigns
The answer was nuanced.
Eugen Systems generally took a hands-off approach. While they never officially endorsed the tools, they also did not aggressively ban players for using them, perhaps acknowledging that the progression system itself was a point of contention.