Klavaro SmartScreen Warning: Why Windows Shows It and How to Run Anyway

When you run the Klavaro installer, Windows may stop it with a blue screen that says “Windows protected your PC”. That message is SmartScreen doing its job on an installer it cannot identify — and Klavaro’s installer is one it cannot identify, because the program is released without a paid code-signing certificate. The warning is expected for the genuine file. This guide explains why it appears, how to run the installer anyway, and — just as important — the situations in which you should not.

What SmartScreen is actually checking

SmartScreen looks for a digital signature that ties a program to a verified publisher. Commercial developers buy a code-signing certificate and sign their installers, so Windows can display a publisher name. Klavaro is free, open-source software maintained by a single developer, Felipe E. F. de Castro, who ships the installer unsigned. Without a signature, Windows treats the file as unknown and shows the warning to everyone, including people who downloaded the perfectly genuine release from the official SourceForge project. The message says nothing about the file being harmful; it says Windows does not know who published it.

How to run the installer anyway

1. On the blue “Windows protected your PC” screen, click More info. The screen expands and shows details about the file.
2. Check that the file name shown is the official installer, klavaro-3.13-win-setup.exe.
3. Click Run anyway. The installer starts normally and you can complete the setup as described in the Klavaro for Windows guide.

You will only go through this once, at installation time. Starting the installed program afterwards does not bring the warning back, so if Klavaro seems blocked every day, something else is going on — work through Klavaro won’t open instead.

Verify first, then bypass with confidence

“Run anyway” is a reasonable click only when you have independent proof the file is genuine — and for Klavaro that proof takes a minute. The download page publishes the installer’s SHA-256 checksum. Compare the checksum of the file on your computer with the published value, as Is Klavaro safe? explains step by step. If the two match exactly, your file is bit-for-bit the official release, and the SmartScreen warning is just the missing certificate talking.

When you should NOT click Run anyway

• The file name is different. Anything that is not klavaro-3.13-win-setup.exe did not come from the official release, whatever the page you found it on claimed.
• You downloaded it from a random software site. Third-party download portals sometimes repackage freeware. Get the file from the official SourceForge link on our download page instead.
• The SHA-256 checksum does not match. A mismatch means the file is incomplete or altered. Delete it and download again; do not argue with a failed checksum.

These checks take less time than the warning makes you fear, and they convert a leap of faith into a verified install. For any other launch problem, the troubleshooting hub collects every fix in one place.

SmartScreen is not your antivirus

It helps to keep two different warnings apart. SmartScreen is a Windows feature and its blue screen is about reputation and signatures: it appears when you run a downloaded file Windows cannot identify. Your antivirus is a separate layer that scans for known harmful behaviour and may show its own, differently worded prompt. Klavaro can trigger the first kind simply by being unsigned freeware; triggering the second kind is less common and is exactly why the checksum check matters — a file that passes the SHA-256 comparison is the same file the project released, whatever a scanner guesses about it.

Windows 10 and Windows 11 behave the same way

The dialog looks slightly different between Windows versions, but the flow is identical on both: the warning hides the way forward behind the “More info” link, and “Run anyway” appears only after you click it. If you do not see a “Run anyway” button at all, you are probably looking at a stricter block — for example a file your organisation’s policy forbids — which is an administrator matter, not something to work around.

Frequently Asked Questions

Why does Windows say it protected my PC from Klavaro?

SmartScreen warns about programs it does not recognize. Klavaro’s developer releases the installer without a paid code-signing certificate, so Windows cannot verify a publisher name and shows the warning for the genuine file. The warning is about the missing certificate, not about anything the program did.

How do I run the Klavaro installer past SmartScreen?

On the blue warning screen, click “More info” and then “Run anyway”. Windows then starts the installer normally. You only need to do this once, when installing; the warning does not appear every time you open the program.

When should I NOT click Run anyway?

If the file name is not klavaro-3.13-win-setup.exe, if the file came from a random download site instead of the official SourceForge release, or if its SHA-256 checksum does not match the value published on this site’s download page. In those cases delete the file and download again from the official source.

Is it safe to bypass SmartScreen for Klavaro?

Yes, when you have verified the file first. Download from the official link on this site, compare the SHA-256 checksum with the published value, and only then choose Run anyway. That combination gives you the same assurance the missing certificate would have provided.