Adobe has been using confusing version names for at least five years.
There are now two versions labeled CC, version 9 and version 10 (also known as CC 2014). Version 10 is the latest, and if you attempt to open a version 10 file in Version 9 that is not fully patched you will get an error message telling you that the file cannot be opened. The latest patch for version 9 should use a cloud-based service at Adobe to convert version 10 files to IDML and allow you to open that.
I suspect you may be using an older operating system. Version 10 requires that your system runs at least OS X 10.7 or Windows 7 SP1 and if you are not it will not even be offered to you.