When Stackwallet installs but will not open, the fix depends on your operating system. The good news: launch problems do not affect your wallet data, and none of these fixes need your seed phrase.
If you ran the app from inside the ZIP preview, it may fail. Extract the entire archive to a folder, keep all files together, and run the main executable.
Avoid running directly from Downloads or a temporary location. Move the extracted folder somewhere stable like your user folder, then launch.
For a build from outside the App Store, right-click the app and choose Open the first time, then confirm. After that it opens normally.
Run chmod +x on the AppImage, then launch it. If it still will not start, try the flatpak build instead.
Reboot, then if needed re-download the official build and re-extract. A corrupted download can cause launch failures; verifying the file against the published checksum confirms it is intact.
Common causes are an incomplete extraction on Windows, the macOS Gatekeeper block for apps from outside the App Store, or a Linux AppImage that is not set as executable. Each has a simple, safe fix that does not touch your wallet data.
For a build downloaded outside the App Store, right-click the app and choose Open the first time, then confirm in the dialog. After the first launch it opens normally. This is standard macOS behaviour and does not modify the app.
No. Getting the app to launch does not delete your wallets, which are stored in the local data on your device. As long as you have your recovery seed phrase backed up offline, your funds are safe regardless of app launch issues.
Follow the full install guide and download only from official sources.