If you are a typical international buyer, you likely purchased from DLsite (English or Japanese) or ANICUTE.
These stores sell boxed versions. The activation code will be either:
If you bought a physical box or digital code via Amazon Japan:
To avoid legal issues and malware, purchase activation codes only from official or authorized resellers.
An activation code is a unique alphanumeric string (e.g., XXXX-XXXX-XXXX-XXXX) that officially unlocks a Synthesizer V product, such as:
Without activation, the software runs in trial mode — typically limited to 14 days, with occasional audio watermarks or disabled export features.
