I have recently purchased Sony Vegas Pro 18 365 subscription. However, the activation key worked for SoundForge, which is a product I didn't know came with SVP 18, but it doesn't actually work for SVP 18. Every time I try to activate SVP 18, it gives me an error saying the Serial number is invalid or for the wrong product, with a Error: -14 at the bottom. What am I doing wrong and how can I fix it?