No. VetScript works inside your existing practice software, so there is nothing new to install or run separately. Once your clinic is set up, electronic prescribing becomes part of your normal workflow.
Setup is a one-time configuration in your PiMS. The steps are covered in your practice software's own guide (for example, Setting up VetScript in PetBooqz).
VetScript upgrades to improve your experience are performed from time to time and will be coordinated with you and your practice software.