https://www.youtube.com/watch?v=D8PHlFH3eek
As of version 2.0.16 you can check at anytime to make sure you are on the latest version of the asset by pressing the check for updates button in the settings provider for the asset. If you have the check for updates on load enabled in the settings which will auto-run this check when you load the project up and only display a message if the asset has an update available. This system checks the GitHub page for updates, stores such as the Unity Asset Store can be delayed by 1-3 business days or longer due to their review process.
You’ll first need to add the asset to your account to access it. If you’ve already done this the “Add to My Assets” button will display something like “Open In Unity”.
Then, in Unity. Access the “Package Manager” via the “Window” tab in the navbar. From there switch to the “My Assets” view for the packages dropdown. From there you’ll be able to select the Save Manager and download/import the latest version. Then all you need to do is import all the files in the package and you’ll be good to go.
Sometimes updates don’t import correctly due to script changes that Unity’s package system doesn’t detect, like old scripts that need to be removed. If you encounter issues from an update, try a clean install of the asset with no asset files imported and that should fix any issues caused. I’ll try to do the clean up for the asset in editor scripts, but there is no guarantee that it’ll work al the time.