Vocaloid 6 Authorization Code ((better)) -

To authorize , you need a 16-digit serial code (often referred to as an authorization code) that is typically sent to you via an order confirmation email immediately after purchase from the VOCALOID SHOP Where to Find Your Authorization Code Order Emails

Upgrade codes are usually sent via email immediately after purchase. Note: You do not need your old V5 code to use V6; you just need the new V6 upgrade license. vocaloid 6 authorization code

Save it in a password manager or a text file on a cloud drive (Google Drive/Dropbox). Yamaha does not keep a backup of your specific code if you lose it unless you registered it to your Yamaha ID. To authorize , you need a 16-digit serial