# Requirements for PCGen

- All versions of PCGen need Sun's Java Runtime Environment (JRE) which is available for all common OS's, including Windows, Mac OS, UNIX and Linux.
- PCGen 5.10.2 (and above) needs to run under Sun's JRE (Java) 1.5.x (or above).
- If you wish to view PDF output sheets, you'll need a PDF viewer.
- Minimum RAM is 256MB (recommended 1-2GB)
- Minimum CPU is 1GHz (recommended 2Ghz+)
- 200MB of free HD space