I have just done a successful test using the latest version of Jaksta Media Recorder on CreativeLive.
The video I tested was a free introductory video and was not paid content or anything I needed to be logged in to access, but as best I can tell Jaksta works on that site.
I am using High Sierra, but it more comes down to the version of Jaksta you are running rather than the Mac OS.
The 2016 comment is not meant to imply that the Windows version supports this site. The apps for Windows and Mac are quite different both in their appearance and functionality, and so on the technical side we can only comment on what the Mac version can or can't do.
Could you please report back your findings if you end up testing the CreativeLive paid content?
The file naming is dependent on the information that Jaksta pulls from the stream.
There is no setting anywhere in the Preferences that has any impact on file naming, but it can be affected by the browser and the way it allows the data to be delivered.
This same mechanism has been in place for a while and has remained largely unchanged, so it would be surprising if having different versions was the cause.
I would suggest to start off by checking to see if you get a similar results as your friend by using the same browser. If you already are, then the next thing to do would be to try different browsers anyway.
I noticed the statement about the Mac version of Media Recorder does not support Creativelive.
Has this issue been resolved and if so which version of the Mac OS is required ?
Also, does the reply from 2016 imply that the windows versions do support Creativelive downloads ?