How to install Sequoia from Yosemite?

I have a Macbook Pro (Retina, 13-inch, Mid 2014) running Yosemite 10.10.5.

I downloaded macOS Sequoia via OCLP but now it's saying it requires High Sierra.

My two questions:

1. How do I uninstall the Sequoia installer from my laptop

2. I don't see High Sierra as an option to download/install via OCLP, so what is my path forward here?

Thanks!