I downloaded and installed jEdit 4.3pre6 onto my PC. It's a Win XP Pro with SP2. I've been running jEdit 4.3pre5 on it for several months without a problem.

I selected to install it to jEdit, having moved the 4.3pre5 files to another folder, then installed. When it was done, I started it up manually. A JVM dialog box appeared and stated that "Main class not found."

I checked the path and found that it was still correct. I made a gif animation showing what happens. Sorry for the size, didn't get a chance to scale it down.

It's here.

Thanks for the assistance.