As soon as you install the latest version of dRofus and run it, you will be prompted to install the ArchiCAD Add-On, if ArchiCAD is installed on the PC. The dialog shown below will pop up. The same will happen when newer versions of the Add On and dRofus are released in the future. You will then be prompted to update the Add On. 
Figure 1: A prompt dialog that suggests installing the Add-On
You can decline installation of the Add-On if you, for example, would like to keep its older version. Notice that if you check "Remember my choice" and press the "No" button, you will never be asked to update the Add-On on this PC. In this case you would have to reinstall the Add-On manually each time a newer version is released, if you wanted to keep it up to date.
In order to install/update the Add-On manually, you have to open the dRofus client and select dRofus->Install ArchiCAD Add-On from the top menu. This menu item will be disabled if the Add-On is already installed and up to date. You can also uninstall the Add-On by pressing dRofus->Uninstall ArchiCAD Add-On menu item.
Remember, that all ArchiCAD instances should be closed at the time you install/update or uninstall the Add-On.
Figure 2: Menu items in dRofus for installing/uninstalling the Add-On manually
The Add-On will be available next time you open ArchiCAD, if installation was completed successfully. A new menu called "dRofus" will appear in ArchiCAD (see Figure 3"Installed dRofus Add-On). Another part of the Add-On is a palette, which you can open by clicking a menu item called "Show dRofus panel". Read more about this in Chapter 3.
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