If you don't see the Canto Connector tool appear you will need to restart your computer. Make sure you do not open Adobe Creative Cloud.
1) Make sure that you have restarted your computer.
2) Go back to the original Canto Connector download link: https://exchange.adobe.com/creativecloud.details.103079.canto-adobe-connector.html
3) Select View My Exchange:
4) Select Uninstall:
5) When the Install button appears again, select Install.
6) Select Sync Extensions:
Should you still have issues afterwards, you might have to install the Canto Adobe Connector manually as described in THIS ARTICLE.