I downloaded it from the sis site, and it works fine as a standalone app. However, it requires activation when I open it in my DAW. How can I make it work?

 

It says in the instructions that the VST is NOT cracked and there is no point of installing it.

 

Oh, I missed it. Thanks for that.
But why is it no point of installing VST? I'd like to use it to harmonize with my vocal tracks though.

 

Unfortunately you can only use the standalone version, the VST version is not cracked, which means you cannot use it as a VST, if you need it as a VST you have to buy it or wait until another team makes it available.