You can force updates a few ways. If you're using wyUpdate as a standalone updater you can check for updates on every start and if there are updates available then launch wyUpdate to begin the update process: How to Silently Check for Updates
You can do something similar with the AutomaticUpdater. However, the AutomaticUpdater works better if you let it run in the background. That is, let the user use your old version while the new version is downloaded, extracted, and patched, then install the new version.