I would try openvino, it might get you part of the way there. Other things to do would be to fix any tape warble or flutter, normalize the volume, do simple th

I would try openvino, it might get you part of the way there. Other things to do would be to fix any tape warble or flutter, normalize the volume, do simple things like high pass filtering anything below 75hz (as most voices don't make audible volume at those frequencies, especially children's voices. Then I would get a spectrum analyzer plugin and see if there are any spots that are clearly music vs children speaking and zap them out. (Audition is pretty good software for this, you might still be able to find the download and mass unlock serial key that Adobe released for version 3.0 somewhere on the internet, of course, this is only for people who bought it as a perpetual license back in the day and need to activate it now that the activation servers have gone offline, so no pirating it!) I'm not gonna say it will be perfect but you might do well enough to be able to hear what everyone is saying and it not sound too bizarre.