Hello Rob,

I did not attempted any failed upgrade of any perl version on my system. But quick look at C:\Strawberry\perl\lib\Config.pm shows me that library version 5.12.3 seems to be hard coded in the code.

... few lines omitted

    *{$callpkg.'::'.$func} = \&{$func};
    }

    *{"$callpkg\::Config"} = \%Config if $export_Config;
    return;
}

die "Perl lib version (5.12.3) doesn't match executable version ($])"
    unless $^V;

$^V eq 5.12.3
    or die "Perl lib version (5.12.3) doesn't match executable version
+ (" .
    sprintf("v%vd",$^V) . ")";


sub FETCH {
    my($self, $key) = @_;

... rest omitted
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