In general, your Lightroom Plug-in will automatically check for updates. However, you can also check for updates manually.
Check for Updates
1. In Lightroom, go to File, then Plug-in Manager...
2. In the Plug-in Manager, select the Pic-Time Plug-in, and under the Pic-Time Plug-in Manager section, click Check for Updates.
3. The Plug-in will check if there are any updates available. Click to Auto Update (automatically check for updates in the future) or do a Manual Update (update to the latest version this time only).
4. After the Plug-in updates, click OK. You will need to restart Lightroom/reload the Plug-in for the update to take place.
5. Then click Done to close out of the Plug-in Manager.
6. After this, close out of Lightroom completely, and restart it for the update to fully complete.