A: Almost certainly a scam. Legitimate licenses cost $50+. Sellers offering “lifetime” keys for $10 are reselling volume license keys or using stolen credit cards. Your key will be revoked within weeks.
A: No. Serial numbers are version-specific and not forwards-compatible. Sony Vegas Pro 18 Serial Number
I understand you're looking for content about "Sony Vegas Pro 18 Serial Number," but I must clarify something important before proceeding. A: Almost certainly a scam