I had problems with using CMP and got some help from Nwhitney, then wrote a step-by-step summary of how to download and install using CMP. Its a May 3 post to the thread with a title, Downloaded, Committed Rules Don't Appear.
I would add something else -
There will be times that CMP appears to be locked up. It usually is not, but is searching for dependencies. Look at the fine print at the left end of the status bar at the bottom of the window. Then, after it has found everything, and you tell it to start downloading (the Start button in the download helper window) it may take a while to get going, and you may again think it is locked up.
On the other hand, it does occasionally lock up, and if it does, you may find as I have, that you have to shut down and reboot your computer. It seems that even if CMP is closed after being locked up, Jet continues running in the background and affects computer performance. Windows usually can't close Jet during shutdown until I respond to one of those blocks that tells me it is not responding and asks whether I want it closed now.
Using Download Helper from the DLS is what got me in trouble to the point I looked for help. It worked fine on a couple of items I downloaded, then messed me up on the third one. It did not download anything, and I did not know how to recognize that it hadn't, hence the title of the thread.
Regarding that message about "Some of your content..". I had that message for awhile, too. Couldn't figure out what to do. One day, I launched TRS from the CMP (a launch icon is on the CMP toolbar above the view window) - there was a fairly long period of file management activity, then CMP closed and TRS launched. Never got that message again. I THINK CMP committed what I didn't have committed before I used it to open TRS.
Hope the summary helps, and good luck!
Dick