Holdout — Desktop

The app isn't actually damaged. macOS doesn't trust apps that aren't signed by an Apple Developer account ($99/year), so it lies and tells you the file is broken. One Terminal command fixes it forever:

1. Unzip the download — you'll get Holdout.app
2. Open Terminal (press ⌘+Space, type "Terminal", hit Enter)
3. Paste this and hit Enter: xattr -cr ~/Downloads/Holdout.app
4. Double-click Holdout.app — it'll open normally now.

If you moved Holdout.app somewhere else, swap ~/Downloads/Holdout.app for the real path.

Same idea as Mac — the .exe isn't signed, so Windows is cautious about new files from the internet. To run it:

1. Double-click holdout-windows.exe
2. You'll see a blue "Windows protected your PC" box
3. Click More info
4. Click Run anyway

You only do this the first time. Windows remembers your decision.

1. Open a terminal in the folder you downloaded to
2. Make it executable: chmod +x holdout-linux.x86_64
3. Run it: ./holdout-linux.x86_64