How do I view online help page for an older version of matlab?

For example, help page for real time audio using Audio Toolbox is given here

https://www.mathworks.com/help/audio/gs/real-time-audio-in-matlab.html

This shows help (including smaple code) for R2025b which I suppose is the latest version

I would like to see the equivalent page for R2021b, since the name of some of the related functions seem to be different (the functionality itself is available I'm sure, just function API seems to be different)

I think back in the day there was a drop down menu that used to let you choose which version of matlab you wanted help for, but I don't know if I am just imagining it at this point, it's not there anymore

Is there any way to see the equivalent help page for a specific version of matlab?

Answer 1

[Walter Roberson]

You can go back 5 years by visiting https://www.mathworks.com/help/doc-archives.html

So, at present R2021b help is still available, but two releases from now it will disappear.

[mahaju]

Are there any off site community backups of this?

[Stephen23]

https://web.archive.org/web/20260000000000*/https://www.mathworks.com/help/audio/gs/real-time-audio-in-matlab.html