Revit 2020 - Dynamo auto updates. Package location?

There can be automatic ways to distribute packages or make the package path change, but they should not distract you from maintaining this select few packages(updating to latest version etc).

Though having said that you may want to have a look at this possible solution to the package distribution question.
https://forum.dynamobim.com/t/distribute-dynamo-in-an-organizational-context/28809