When I try to install the app in Dreamweaver Extension Manager CC 2015 I get the following error:

This extension can not be installed, it requires Dreamweaver version in range of inclusively between 12 and 15.

I associated the file type in Windows 10 with Extension Manager CC, which is up to date as of this minute. I purchased this some time ago and it would not install then, and I forgot about it, but now I would like to be able to use the extension that I purchased, if that isn't too unreasonable? tia

Hi Jim,
Adobe discontinued support of Exension Manager for CC2015.
Please use the DMXzone Extension Manager in order to install your extensions: www.dmxzone.com/go/22670/dmxzone-extension-manager-for-dreamweaver

Thanks Teodor,
I was able to install the manager and the mp3 player extension, but with no joy for embedding in a web page. On the configuration screen the two tabs at the top left are blank - from looking at instructions they should be 'General' and 'About' but they are blank and not enabled. When I set up a test page with 7 songs set to autostart at 50% volume, I get this:
free-classic-music.com/Glenn-Miller/index2.php

I am Windows 10 hp laptop with 12gb ram and Adobe CC 2015