You just have to download the full bundle here (choose the last version and mirror 1) and install the bundle. When installing, you will choose "MFreeFXBundle" to avoid to install the payware plugins. Hence only the free plugins will be installed, including the MTuner. That's all. There is gang screen when you open it (simply to suggest a donation) but all these tools from the MFreeFXBundle are totally free and fully functional forever.
This MTuner is certainly the best tuner you will find.
As I've stated, I have the installation and the DLL. The DAW ignores it. It's not that much big of a deal, but thanks anyway. I was simply intriguied by this quirk. It's a proper vst, it's in the right folder, and it is the only plug-in not loading. As it is removed from the SSL website, I suspect something weird going on.