Windows shows a warning during setup

Updated November 15, 2026 · 2 min read

Devchaos' setup file isn't digitally signed yet, so the first time you open it Windows may show a blue window saying it doesn't recognise the publisher. If you downloaded the file from devchaos.com, press More info, then Run anyway.

Who it's for

For anyone installing Devchaos on Windows.

Download the file from devchaos.com

Download the setup file only from the download page; you sign in with your devchaos.com account to get it. Don't open a copy that came from another site, a message or an e-mail.

Open the file

Double-click the downloaded file. If Windows opens a blue window titled “Windows protected your PC” (Microsoft Defender SmartScreen), press More info under the text. The window then shows the file's name; the publisher isn't recognised.

Press Run anyway

Press Run anyway. The Devchaos setup window opens; pick your language and carry on. Installing Just for me doesn't need administrator rights.

Why the warning

Windows can't confirm the publisher of a program that is unsigned and not yet widely downloaded; the warning says that, not that it found a problem in the file. Once installed, new versions come through the app by themselves; see updates.

Something went wrong?

There's no Run anyway button.

On work or school computers an administrator may have turned that choice off. Ask whoever looks after the computer.

Setup says “The setup file looks damaged”.

The download may have stopped halfway. Delete the file and download it again from the download page.

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