If you have installed the license using the License Manager, and you see it there when the product name/version is selected in the "Components", drop-down, you should be OK.
Only if there are doubts about whether the license works properly, here is a decisive check:
The EasyXXClient objects have a LicenseInfo property, which contains a dictionary of license fields, such as serial number, subject name, etc. You can read this information using the code and verify if it is correct. The easiest way is just to look at the serial number - it should be the same as on your license key. If, for any reason, the license is not recognized, there will be a default number, for a trial license, something like: 1111111120 or close.