Q. Is a trial version of VOCALOID7 available? Do I need to uninstall the trial version when switching to the full version?
Yes. Please see the following page:
https://www.vocaloid.com/en/vocaloid7/trial/
If you purchase the full version while using the trial version, you do not need to uninstall the trial version. Launch VOCALOID7 Authorizer and enter the serial code provided with your purchase to continue using it as the full version.