I use a "different" technique.
First I download all the cdp's I want/need and place them in a "temp" folder.
Then I open CMP and use the "import CDP" function to import all the freshly downloaded CDP's in one go and have them shown on the main screen. When correctly installed, fixed ( when needed ), dependencies checked and "saving" the content with CTRL+M; I then move the files in the temp folder to the CDP back-up folder on my external HD. Never fails.
NB: While installing I also allocate keywords to the new items for easy access while working I surveyor.