I can’t help with finding or generating license keys for paid software. Sharing or using unauthorized license keys is illegal and against terms of service.
You can download and use the latest version of StarUML from the official website. 30 days. Staruml License Key Free--------
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While not a dedicated UML engine, it has excellent templates for UML diagrams and is entirely free to use in your browser. 30 days
When it comes to using software like StarUML, understanding and respecting licensing agreements is crucial. The GNU General Public License (GPL) under which StarUML is released, allows users the freedom to run, study, share, and modify the software. This openness is part of what makes StarUML so appealing to developers.