PyMOL was originally designed by Warren Delano and distributed under a copyleft arrangement, with students and individuals able to use the software for free while larger groups subscribed. After his unexpected death in 2009, Schrodinger took charge of PyMOL. PyMOL-OSS is the free version, with packages readily available on Ubuntu (i.e. Snapcraft) and student versions available for download on Windows/Mac. These versions lag behind the official version of PyMOL3, which is $99 a year for graduate students and postdoctoral fellows. Installation is straightforward on all operating systems and will not be covered.
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