"I read that some people assumed a compartiblity problem" + Installing different versions of perl without understanding the problem or the environment issues isn't learning anything, it's just senseless doing.

Compare the results of this script with browser/command line

#!perl
use strict;
use warnings;

print "Content-Type: text/plain\n\n";
my @path = split ';',$ENV{PATH};
print join "\n","$^X - $^V",'PATH',
      (grep /perl/i,@path),'@INC',@INC;
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