Why windows smartscreen prevent unrecognized app like star watermark sometimes?

When you download Star Watermark or Star PDF Watermark for Windows, you may receive the following message:

Windows protected your PC

Windows SmartScreen prevented an unrecognized app from starting. Running this app might put your PC at risk.

That's because we did not purchase a digital signature certificate for our softwares, and a digital signing certificate will cost hundreds of dollars one year, which is a bit expensive for us.

The warning message you receive does not mean that our software is insecure, just because we did not buy a digital signature certificate. We guarantee that our Star Watermrk and Star PDF Watermark are 100% safe and clean.

Thank you for your understanding.

What to do when you receive a warning message?

When you receive SmartScreen preventing message:

If you receive message as above, please click "More info", then please click "Run anyway" as below:

When you receive User Account Control (UAC) preventing message:

If you receive message as above, please click "Yes" to start Star Watermark Program.