Try to install extension in Flash 8

Wanted to try "VocaliseWavDemo" but it needed a more recent version of the extension manger. I found the manager v1.7 and clicked on the installer but I keep getting a error 1316 A network error occurred... before it finishes installing it.

Please offer suggestion.

Thanks

Did you download that from Adobe and is this the newest version?

Yes the latest version for Flash 8 from Adobe's website.
I'm wondering if it's Windows Vista?