Download the most recent pre-built executable from GitHub Actions
Go to https://github.com/LightningDev1/LightningBot-Free/actions and navigate to the latest successful workflow run (one with a green checkmark). There you will find a download link to an archive called "artifacts.zip" which contains executables for Windows, Linux and macOS.
Build from source code
git clone https://github.com/LightningDev1/LightningBot-Free
cd LightningBot-Free
go get
go build