Older version code

Have license for 2.1.*. I am unable to find download link for latest version gojs eg. 2.1.56. Kindly guide me how can I download same.
Also how can I upgrade my license to 2.2 version.

Most people use npm to download specific versions, e.g.: npm i gojs@2.1.56
Or refer to a particular version library using a CDN such as: https://unpkg.com/gojs@2.1.56
Read more at Download GoJS

If you want to upgrade to version 2.2, just ask for a new license key at: Product Activation