Sorry if the process of installing Remixvideo as a VST/AU plugin is not clear, it will be improved in the next update.
In the meantime, I can help you install the plugin with the following steps below. The plugin is also available in the Demo version, so you will be able to test it
How to install Remixvideo as a plugin:
Open Remixvideo and click on Remixvideo's software menu that is located in the top bar of the screen.
Then select "Install as plugins".
Where are the plugins located once installed?
Remixvideo does not have the permission to install anything in the system folder because of Mac App Store regulations. Instead, it will be installed in the "User" folder that can be accessed as follows.
Drop down the "Go" menu and hold down the option key on your keyboard (alt key). "Library" will appear only while the key is pressed.
On Mac, Remixvideo plugins are stored under:
The VST is in the VST subfolder and the AudioUnit plugin is in the Components folder.
Let us know if you have any questions regarding those installation steps. We can also look at the procedure to retrieve Remixvideo's plugin within a specific DAW (just let us know which one you are using).