To activate your new license key (Product Code), follow these steps directly in the app. How to Activate Using a Product Code
If budget is tight, consider (similar price) or use OsmAnd with truck plugin (more technical, but cheaper).
Yes. A Sygic Truck licence key unlocks truck navigation for the entire world. However, you must download the specific country maps offline separately (free via WiFi).
There are a few ways to obtain a Sygic Truck License Key: