The authorization grace period for VOCALOID7 Editor or the voicebank may have expired.
VOCALOID7 Editor and voicebanks can be used without authorization for a limited period after installation. After the grace period expires, they can no longer be used.
Use the serial code provided with your purchase to authorize the product in VOCALOID7 Authorizer. After authorization is complete, you can continue using VOCALOID7 Editor and the authorized voicebanks.