: You can download StarUML 5.0 (the open-source legacy version) from SourceForge .

: Run the staruml-5.0-with-cm.exe installer. This version is licensed under the GPL, meaning it is free to use forever. Official Pricing for Full Features

: Visit the official StarUML download page and select the Windows (x86) installer.

The current version of StarUML (including v5.0.0 and newer) is proprietary software. You can download and use it legally without an activator by following these steps:

If you wish to remove watermarks and support the developers of the current version, you can purchase a perpetual license:

If you need a version that is entirely free for any purpose without watermarks or trial limitations, you can use the original open-source version (StarUML V1). Note that this version is no longer maintained and lacks the modern features of V5.

While there are many websites offering "activators" for StarUML 5.0.0, these tools are often associated with security risks like malware and violate the software's End User License Agreement .

: Approximately $129.00 for a one-time payment.