What is a "license number" and how to find the license number in Toad for Oracle. Invalid license number error. (4270658)

How can a Toad for Oracle or Toad family products license number be looked up? 

What is the difference between a "license number" and a "license key"? 

A license number is different from a license key.
A license number is a sort of serial number that is used for account tracking.
It is associated with a company's license account.
It Is most often used when referring to the account and not as often used within the product itself.

The "license key"  also known  as a "key" or "authorization key" is used to register the license into the product.
This is often used within the product itself. 

To look up a license number that is associated to a license account/key please try the following:

SOLUTION 1:

In Toad for Oracle version 10.0 or older.

1. In Toad for Oracle, go Help | Register Toad.

2. The License Number is located within your Site Message.

Example:
Site Message: [ACCOUNTNAME]-XXX-XXX-XXX

SOLUTION 2: 
In Toad for Oracle version 10.0 & newer

1. In Toad for Oracle, go to Help | Licensing.

2. The License Number is found in the License Details section of the window.

Example:  
License Number: XXX-XXX-XXX

3. Or, if the License Number is not populated in the License Details section, then the License Number could be located within your license key (if working with a new format license key).

Example:  D4VFTR0KNN525JNLJPXCY4MMAH28VK1MYFSRW-XXX-XXX-XXX-AF

SOLUTION 4:

If the license number still can not be located or if there are further questions regarding the license, create a licensing service request on the Licensing Assistance page on the Quest Software support portal.