Get started
Set up in three steps
About a minute. Do them in order and you'll never hit a security warning.
Install
Open the downloaded insomniac.dmg and drag Insomniac onto the Applications folder. You can eject the disk image afterward.
Opened it already and macOS said it “can't be verified”? Don't panic — that's expected for a not-yet-notarized app, not a sign anything's wrong. Click Done (never “Move to Bin”), then do step 2. See what it looks like ↓
Clear it for launch — before you open it
This is a free test build (not yet through Apple's paid notarization), so macOS quarantines it. Open Terminal (⌘ Space → “Terminal” → Return), paste this, and press Return:
xattr -dr com.apple.quarantine /Applications/insomniac.app
Run this before the first launch and the “Not Opened” warning below never appears. (Already saw it? No harm — just run this, then open again.)
Open it & find it
Open Insomniac from Applications — it launches cleanly from now on. It has no Dock icon; it lives in the menu bar at the top-right of your screen. Look for the moon (a welcome guide points right at it on first launch). Click it, flip Stay Awake on, and enter your Mac password when asked.
If you see this, don't panic.
Insomniac is code-signed — it just isn't notarized yet (that needs Apple's paid Developer Program). macOS shows this for any app installed outside the App Store without notarization. It's not a sign that anything is wrong with the app.
If it appears: click Done — never “Move to Bin.” Then run the xattr command in step 2 and open the app again.
Best of all: run that command before your first launch (as in step 2) and this dialog never shows up at all.