if you just want to have fun making little vocal synth covers but it's wayy too expensive read this :3
despite other vsynth softwares being relatively easy to find downloads for, synthv pro requires some jumping through hoops so hopefully this can be of help!
all you have to do to get synthv pro working is download the svkey tool, the latest version of the pro editor from the spreadsheet, and then download and install whatever voicebanks you want. Instead of running the editor on its own, run the key tool instead, which will launch the pro editor and make it useable!