// INVITED TESTERS
Nessie private beta
Try the app on your PC and share what works, what feels unclear, and any issues you find. This build is for invited testers.
Windows installer
Private beta 1.4.2
2026-10-07 · 29.3 MB · Windows 64-bit
Download private betaDownloading does not start your test window or issue a key. No purchase is required for this invitation-only test.
Unsigned test build
Windows may show an unknown-publisher warning. Verify the file before running it. A matching hash identifies this build; it does not guarantee that antivirus software will accept it. Installation and antivirus acceptance are still unverified for this candidate.
Your test access
72 hours on one PC
Key distribution pending
You need a separate Nessie-issued 72-hour key. Nessie will send invited testers their key directly; this page does not generate or email one. Wait for that key before activating.
The 72 hours start at your first successful activation on one PC and continue while the app is closed. Downloading or reinstalling does not reset the clock.
A Discord invitation code is separate and cannot activate Nessie. Keep your test key private.
Verify this exact download
In PowerShell, from the folder where you downloaded the installer, run:
Get-FileHash -LiteralPath '.\nessie-1.4.2-private-beta-setup.exe' -Algorithm SHA256The result must match all 64 characters:
ee38093ab37c36a0dc2b5d2d9d8148015299b243855a8245b62f86d1e5cddef6Exact size: 29,319,557 bytes. If the hash differs, stop and contact tester support before running it.