
You can free download and use it as long as you like. So, if you have old iMac that only run up to El Captain, you are out of luck. OsiriX Lite is a completely free software. Answer (1 of 2): Current available download version which is version 12.5.x or later requires you to have Sierra. * Developing Swiss Quality DICOM Viewer since 2003

* Ultrafast performance * Intuitive interactive user interface * Exclusive innovative technique for 3D/4D/5D navigation * Distributed under Open Source licensing - LGPL * Open platform for development of processing tools * The most widely used DICOM viewer in the world * More than 50'000 users * Thanks to all OsiriX users who believe in an open, different and free future in imaging. They are certified as medical devices for primary diagnostic imaging.

In some countries (for example, USA and Europe), you can only use OsiriX as a reviewing, research or teaching software, not for primary diagnostic, used in clinical worklfow and/or for patient care.For these reasons, several commercial versions of OsiriX exist. OsiriX, being a free open-source software (FOSS), is not certified as a commercial medical device for primary diagnostic imaging.

