OK, you do know the old memberlist crashes servers as if they're flies

The best thing you can do is simply change public_directory to make the memberlist look like the 6.3- one (although the old look requires you to use a 1024x768 screen+, otherwise every line would take more than one line, and it's not efficient at all

)... if you don't care about speed and cpu usage, you can also hack the old memberlist and disable the new one from CP.