Assuming you have already completed a safe download, here is the step-by-step installation:
Q: Client crashes on launch.
A: Make sure you are using Java 8 and allocated at least 2GB of RAM. Pixel Client 1.16.5 Download
Q: "Pixel Client" modules not showing.
A: Disable other conflicting mods (OptiFine usually works fine). Assuming you have already completed a safe download,
Q: Is this client allowed on my server?
A: Pixel Client contains “unfair advantages.” Only use on servers that explicitly allow hacked/utility clients. Pixel Client 1.16.5 Download
Pixel Client is often distributed via:
Be extremely wary of generic “mediafire” or “dropbox” links from unknown forums.