Step 1:
...
download the installer for the Windows x64 Vividizer Plug-In found here: https://vivaldi3d.com/pages/downloads
Step 2: Run the installer as shown in the video below.
The file path to the vst: C:\Program Files\Common Files\VST3\Vivaldi3d\Vividizer.vst3
...
Uninstallation Instructions
Navigate to
C:\Program Files\Common Files\VST3\Vivaldi3d\unins000.exeRun the uninstaller by double clicking the uninstaller executable and following the prompts