Here's a very basic example in Node.js to generate a key and add it to GitHub:
Purchase a genuine license from the official WinRAR website. It is a lifetime license with free upgrades, meaning you only pay once to support software you might use for a decade. rarreg.key github
A completely free, open-source file archiver with a high compression ratio. It supports virtually all archive formats (including unpacking .rar files) and features its own highly efficient .7z format. It has no advertisements, no pop-ups, and no paid tiers. Here's a very basic example in Node