Do not click those links. You will get a virus, not a plugin.
If you absolutely must use the authentic sounds of Nexus in your productions, there is one genuine workflow. But it's not a solution for a purely mobile setup:
If you are looking to get those iconic Nexus-style sounds on your mobile device safely and legally, this comprehensive guide will explain the technical limitations, warn you about download scams, and provide the best free alternatives to achieve that professional sound. The Reality of Nexus on Mobile
Do not fall for websites promising a free Nexus plugin download for your phone. Instead, use the DirectWave sampler to import free .dwp sound packs, or master the built-in GMS and MiniSynth engines to create your own professional leads, pads, and plucks safely.
Because of this architecture,
If your downloaded pack is a .zip file, use your phone’s file manager to extract it.
Don’t sleep on the stock plugins inside FL Studio Mobile!
If you are on Windows, yes, you can use the desktop plugin. If you are on Android/iOS, this will not work.