Some users report success with:
Official "trial extension" methods for Letasoft Sound Booster do not exist outside of a new purchase, as the software links trial periods to specific hardware IDs [17, 18]. The 14-day trial letasoft sound booster trial extension
If a user recently upgraded to Windows 11 or changed their sound card (e.g., from Realtek to an external DAC), they may need to re-evaluate how the booster interacts with the new setup. Resetting or extending the trial allows for thorough testing without financial commitment. Some users report success with: Official "trial extension"