Advanced Duplicator 2 is a Garry's Mod addon which implements a tool similar to the Duplicator, but with many added features. It is a fork of (and not a direct successor to, despite the name) Advanced Duplicator.
Currently, this version of AdvDupe2 isn't available on the Steam Workshop. The best way to get this addon is to clone this repository into your addons folder:
cd "%programfiles(x86)%/Steam/SteamApps/common/GarrysMod/garrysmod/addons"
git clone https://github.com/wiremod/advdupe2.git advdupe2
Copyright 2014-2016 Wire Team
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.