To be totally frank a lot of those legacy plugins are pretty poor compared with what is available today. I’m guessing that Steinberg feel the same way. However I did find a version of Embracer a while ago that came as a dll file. Perhaps somebody still has a version of this?
Frequency? Well I won’t be giving up Pro Q 2. It is an ok eq but no more than that. I am afraid that I have never used the native plugins other than trying them out. A shame but there you are.