Impulse isn't used anymore for the Object Desktop apps and the renewal will never show on it. Impulse is now a games distribution platform owned by GameStop. Stardock is working on another app manager and until it is done the app installers need to be downloaded from here https://store.stardock.com/myaccount/products
They are stand-alone installers which require only a double-click to run, no software manager. Sometimes an uninstall of the previous version is required via Impulse.