No, I haven't heard of cb_share_config. I just ran with the binary download for each platform (which is what my students will do anyway) and can't find nightlies anywhere...
Searched the forums for info on cb_share_config just now but don't get much more info than this. Where can I get it and what exactly does it do? Is it available for all platforms?
If you have installed the 8.02 binaries from download-section, you should have it, or you are able to install it.
On windows you have to chose it on the installer page, where you chose the type of installation (just check "C::B share config", it's not checked by default).
You may have to reinstall C::B to do so, but this should not change your "default.conf" (nevertheless it's always safe to backup the config of course).
The executable is in the same directory, as the codeblocks binary.
On debian it's part of the main ("codeblocks") package and will be installed to "/usr/bin".
I don't know inside which package it is on other distros (or on Mac), but it should be there.