Get Checked Off, free, during the beta.

That's expected right now, not a sign anything's wrong. Windows and browsers flag new downloads based on how many people have installed them before — as more people download Checked Off, this fades on its own.

In Microsoft Edge

Edge may show "[filename] isn't commonly downloaded. Make sure you trust [filename] before you open it." Click the "…" next to that entry in your downloads, then choose "Keep anyway."

In Google Chrome

Chrome may show "Suspicious download blocked" in your downloads. Click to expand that entry, then choose "Download suspicious file."

When you open the installer

Windows may show a full-screen "Windows protected your PC" message. Click "More info" (it's a small link, easy to miss) — that reveals a "Run anyway" button, along with the publisher name. It should read "321 Oak Inc." — that confirms it's really us.