From Protege Wiki
Protege Desktop 5.0 Installation Instructions
Platform specific instructions
Click on the links below for the platform specific instructions. The platforms-specific archives include the Java JRE, so it is not required to have Java installed on your machine. Use the platform-independent archive if you would like to use a specific version of Java, or if your system is 32-bit (the case with older computers).
Includes the JRE, and works for 64-bit Windows platforms
Includes the JRE, and works for 64-bit OSX platforms
Includes the JRE, and works for 64-bit Linux platforms
Does not include the JRE, requires a Java version 8 or newer installed, works on any platform
Q: When I try to run Protege from the platform-independent archive with the run script, I get an
"Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file"
A: Most likely you have an older Java version installed. Protege requires Java 8 or later. Please see the documentation above on how to check which version of Java is installed on your system.
How to get help
If you have problems installing or running Protege Desktop, please refer to the troubleshooting section first. We also recommend searching the mailing list archives, as the problem and a solution might have already been posted.
If you can't find the answers from these resources, send an email to the Protege User Support mailing list (you need to be subscribed to post). Please be as specific as possible and try to include the following items:
- What is your operating system (e.g., OS X 10.9, Windows 7, etc.)?
- What is your Java version?
- What are the specific steps to reproduce the problem?
- Are there any error messages in the console window or the log file?
- What is the observed behavior?
The more detail you provide up front, the more helpful we can be in terms of a prompt response.