Yes, it does still exist and is now combined with standard CU as you guessed. Your ability to download says it is still working for you.
The items that are on CU+ have a cloud icon next to their listings. For those that are in a group folder - the clouds can only be seen when entering that folder.
Also try pressing the "Alt" button when in the CU section, that will take you to the CU+ Download Manager. Pressing it again takes you back to the combined CU section.
I'm unlikely to be around to assist with anything further, many others can with this subject.