Boris FX no longer sells RED as a standalone. Instead, they offer (BCC) which includes the "Title Studio" module – the modern descendant of Boris RED.
One App. Every Tool. It's fast, free, and works on both macOS and Windows. All you need is an email- no payment required. Boris RED - Download - Softpedia boris red 5.6 free download
This article explores why Boris RED 5.6 is still relevant, what makes it unique, and what you need to know before attempting to download it. Boris FX no longer sells RED as a standalone