InVision is a great tool for prototyping and creating visuals for your ideas. However, it can be difficult to download a prototype.
In some cases, you may need to pay for a subscription. In other cases, you may need to create a prototype account and then pay for a subscription.
If you want to download a prototype, your best bet is to create a prototype account and then buy a subscription. This will allow you to download any prototypes that you have purchased.