SIMUNE team has prepared the SIESTA utilities for various operating systems: LUNIX (Ubuntu v18.04, v20.04, Debian10), MacOS (Catalina 10.15.7 and lower), and Windows 10.
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SIESTA v4.0 was released in 2016 under the terms of the GPL open-source license. Since then, various branches and official version of SIESTA have been produced, including version 4.1, and psml-version. Please find a guide to different versions of SIESTA at the wiki-project:
https://gitlab.com/siesta-project/siesta/-/wikis/Guide-to-Siesta-versions