You're looking for Serum, a popular wavetable synthesizer plugin, and you want to download it for free using FL Studio. Here's what you need to know:

Using the free versions of Vital or Surge XT is always better than risking your computer's health for a pirated copy of Serum. To help you find the best starting point for your music: you produce (to find free presets) Your computer specs (to ensure the plugin runs smoothly) If you want a tutorial on setting up free VSTs in FL Studio Tell me which you'd prefer to explore first!

Multiple synthesis types (FM, Wavetable, Physical Modeling). Completely free forever. 3. Vitalium