I downloaded and installed two versions of Qt, one is 5.9.4 and the other is 5.11.2. On operating system, one is shown with Community tag and the other with Enterprise tag. I wonder what the difference is:

To clarify, I think I downloaded open-source version of Qt 5.11.2, but it is tagged as enterprise.
Qt Creator Commercial Features:
You can use the following Qt Creator features if you have the appropriate Qt license.
Performance Analyzer
https://doc.qt.io/qtcreator/creator-commercial-overview.html
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