How to download

The alpha is unsigned, so your operating system will try to stop it the first time. That is expected — nothing is broken, and the two-minute walkthrough below gets it running on your machine.

It is safe to run, and the download is not modified. Signing & notarization require paid developer accounts, which are on the roadmap. Until then macOS and Windows show a security warning on first launch. Check the SHA-256 checksums on the GitHub release to verify your download anytime.

macOS

Open the .dmg you downloaded from tellnova.com.

Double-click it from Downloads or the browser's file list.
Drag Tellnova into Applications.
Launch it once. Gatekeeper will block it — you may see either of these messages:
```
"Tellnova" is damaged and can't be opened. You should move it to the Trash.

"Tellnova" cannot be opened because the developer cannot be verified.
```
That's the unsigned-build warning, not malware detection.
Open Terminal (Spotlight → type “Terminal”) and run:
```
xattr -cr /Applications/Tellnova.app
```
Removes the “downloaded from the internet” quarantine flag that triggers the check. It does not modify the app itself.
Launch Tellnova normally. It's installed.
On Apple silicon (M-series) and it still says “damaged”? Give the app a local ad-hoc signature:
```
codesign --force --deep --sign - /Applications/Tellnova.app
```
The trailing - means “sign with no identity” — it satisfies the CPU's code-signing rule with no certificate required.

No Terminal? Try System Settings.

Attempt to open Tellnova once, then go to System Settings → Privacy & Security and press Open Anyway next to the blocked app entry.

Note: on macOS Sequoia and later, right-click → Open no longer bypasses the check — use the steps above.

Windows

Open the .zip you downloaded and click Extract all.
Double-click Tellnova.exe inside the extracted folder.
Windows SmartScreen will pop up: “Windows protected your PC”. Click More info, then Run anyway.
First launch may take a few seconds. That's it.

Tip

The ZIP is portable — there is no installer. Keep the folder somewhere permanent, then pin Tellnova to the taskbar with right-click → Pin to taskbar.

Linux

Open a terminal in your Downloads folder and make the AppImage executable:
```
chmod +x Tellnova-*.AppImage
```
Run it:
```
./Tellnova-*.AppImage
```
On systems without FUSE it may refuse to run — extract and run it instead:
```
./Tellnova-*.AppImage --appimage-extract-and-run
```

Verify your download (optional)

Each GitHub release lists SHA-256 checksums.

Check the file you downloaded:

# macOS
shasum -a 256 ~/Downloads/Tellnova-*.dmg

# Windows (PowerShell)
Get-FileHash -Algorithm SHA256 .\Tellnova-*.zip

# Linux
sha256sum Tellnova-*.AppImage

Compare the output against the checksum on the release page.

Read the guide on GitHub ↗

← Back to tellnova.com