Are you trying to install a module that requires Perl 5.8.7 on a perl 5.6.1? This is just asking for trouble.

I’m trying: “use Kepler qw(:all);” and I get “Internal Server Error”

Time to look at the web server's error log.

It might also help to just run the CGI script from the command line, and see what kidn of output it produces.

And finally local::lib has helped me greatly with local perl module installations, I can highly recommend it.