PRISM is free and open source software. You can download both the tool and its source code for free from below. Distribution is under the GNU General Public License (GPL), version 2.
The current version of PRISM is 4.7 (first released 19 Mar 2021). The main changes since the last public release (4.6) are listed below. More details for individual releases are in the CHANGELOG.
improved model type auto-detection (MDP/PTA/LTS/POMDP/POPTA)
To access more recently developed features, get the latest code from GitHub.
PRISM should run on 32/64-bit versions of all major operating systems. We distribute pre-built binary versions for various architectures. But for non-Windows platforms, it is usually easy to build from source code.
Note: Your version (32- vs 64-bit) of Java must match that of PRISM. In particular, to use the 32-bit Windows binary, make sure you are running a 32-bit version of Java.
If you have any problems, first check the list of common problems and questions.
If you are still stuck, post a message in the forum.
Once you have installed PRISM, you might want to look at: