If you still use version 1.12, consider upgrading officially:
Letasoft offers a free trial for version 2.x, so you can test before buying. letasoft sound booster 112 activation key install
Contact Letasoft support with your purchase email/order ID. They will resend it. If you still use version 1
Some cracks disable online verification, but they break after Windows updates or driver changes. You also lose all safety. Letasoft offers a free trial for version 2