If you find a "serial number" containing only digits, it is likely not a valid activation key . These are often: Order Numbers
Official serial numbers for VEGAS Pro 15 (formerly Sony Vegas) do not consist of only numbers; they use an alphanumeric format Boris FX Forum Official Serial Number Format sony vegas pro 15 serial number only numbers
: If the program is already installed and activated, you can often find the key under Help > About If you find a "serial number" containing only