Download the modpack

Extract the pack from its zip

Extract it to a folder and then go to the folder and run the .exe

Windows Defender will flag any unrecognized processes created by unverified companies. Since BTE is a project, they pack itself is unverified by Microsoft but 100% safe

Click run anyway to have Windows ignore Defender.

Install the pack itself

Ensure you are on "Build The Earth" pack and click Play!