If you need to download FL Studio 12 specifically, Image-Line maintains an official FL Studio Installer Archive for licensed owners.

Mixer and Routing Improvements The Mixer in FL Studio 12 continued to be a powerhouse for routing, bus processing, and effects chaining. New mixing workflows and improved visual feedback helped producers manage large sessions more effectively. Sidechain routing techniques—vital for contemporary electronic music—became easier to implement through flexible routing and send channels. This made it simpler to craft the tight, punchy mixes that define many modern genres.