Yes, make sure your toolkit is updated to the latest version. The layout of the app is a little off (at least on a Retina Macbook), but if you point the mouse at the upper right corner of the app, just below the menu, you'll see it changes colour a little and you can click on it. That will bring up a little pop-up to tell you if there's an update available. The current version (released 2014-07-08) is 2.6.1.0 - eda5f722 Now, here's the problem... the app will appear to download an update, but it won't actually install anything (or at least not that I can tell). Just keep going through the process and clicking update, and usually after 3-4 tries it will actually download and install the update. You can tell if it was successful by looking at the version number in the title bar. @@JStar_98... I'm not sure how much help you need, since your question isn't very specific. So I'll give as much detail as I can, and please forgive me if I list things you already know how to do. All of the cDLC here is posted on file sharing services such as Dropbox, Google Docs, etc. Go to this link: http://search.customsforge.com and find the cDLC you want to download. Click on the "DL" link (downwards arrow pointing to a tray) and that will open the forum page where the cDLC is listed. Scroll down to the bottom of the song information, and you will see the sections "Release Notes" and "Download Link" If the charter has posted a Mac version there is sometimes a separate link in the "Release Notes" section. Otherwise, click "Download Link" and that will take you to the file service hosting the file. Depending on the filehost, it will either automatically download the file, or give you a download button to push. Some charters who use Dropbox will have Mac and PC (and PS3/Xbox) versions hosted. Simply find the Mac version (ends in "_m.psarc") and download that. The default folder for Mac downloads is the "Downloads" folder. If there is no Mac version, simply download the PC version (ends in "_p.psarc") and use the Toolkit to convert it. Open the Toolkit, go to the Converter tab, and set the correct settings. Source is "PC", target is "Mac". Use the default Cherub Rock AppID, unless you downloaded a different official DLC, and if so use that AppID. Click "Choose DLC To Convert" and navigate to your Downloads folder and find the file. It usually takes 15-30 seconds to convert a file. If it hangs for more than 2 minutes that means that the file won't convert. Force Quit the app using the main Apple Menu (Apple icon in the top left corner of your task bar) to quit if it hangs. After successful conversion or download (if you started with the Mac version) copy the file to your Rocksmith DLC folder ("/Users/[yourusernamehere]/Library/Application Support/Steam/SteamApps/common/Rocksmith2014/dlc") and load the game by opening Steam (don't start Rocksmith) and launching the RSInjector app. Steam and Rocksmith MUST be installed into the default directory, or RSInjector will not be able to locate and launch Rocksmith. Lastly, say goodbye to your free time and other hobbies. You won't be seeing either for a little while :P