When I click on edit text it shows a warning popup to upgrade it to 4.24.0-lts.
When I tried upgrading it to the specified version it gives below error.
<code>[CKEDITOR]: The license key is missing or invalid.
If you suddenly started to see this message, this may mean you accidentally updated CKEditor 4 to the LTS version (4.23.0 and above). This version of the editor is under commercial terms and requires acquiring an "Extended Support Model" contract - https://ckeditor.com/ckeditor-4-support/
For more information about this error go to https://ckeditor.com/docs/ckeditor4/latest/guide/dev_errors.html#invalid-lts-license-key
</code>
<code>[CKEDITOR]: The license key is missing or invalid.
If you suddenly started to see this message, this may mean you accidentally updated CKEditor 4 to the LTS version (4.23.0 and above). This version of the editor is under commercial terms and requires acquiring an "Extended Support Model" contract - https://ckeditor.com/ckeditor-4-support/
For more information about this error go to https://ckeditor.com/docs/ckeditor4/latest/guide/dev_errors.html#invalid-lts-license-key
</code>
[CKEDITOR]: The license key is missing or invalid.
If you suddenly started to see this message, this may mean you accidentally updated CKEditor 4 to the LTS version (4.23.0 and above). This version of the editor is under commercial terms and requires acquiring an "Extended Support Model" contract - https://ckeditor.com/ckeditor-4-support/
For more information about this error go to https://ckeditor.com/docs/ckeditor4/latest/guide/dev_errors.html#invalid-lts-license-key