The detailed change history of each item can be publicly accessed in the changelog tab:
One example: https://mui.com/store/items/minimal-dashboard/#changelog
The store doesn't provide a notification system for new updates yet. Instead, you can have a quick glance at what the latest version is, and when it was last released.
Once you have identified an update/upgrade you would like to use, you can follow: How do I get access to an item I purchased?
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