If you get an error, then you need to update your JDK.
You can test what version you have by opening a command prompt and typing:
You need either version 7 or 8 of the Java Development Kit - JDK.
I suggest the latest JDK 8 version from:
The regular JRE runtime is not enough because PowerEYE needs to compile the included Java JSP files as it serves you its web pages.