If Windows 10 warns about an unverified application, do not disable security protections simply to make the warning disappear. First verify who published the program, where the installer came from, and whether the developer provides a signed or Microsoft Store version.
If Windows is only limiting where apps can come from
Some Windows configurations have an app-installation preference under Settings > Apps > Apps & features. If your edition exposes that control, review it rather than changing Registry values or disabling antivirus protection. Windows 10 in S mode has stricter restrictions and requires leaving S mode before installing ordinary desktop apps outside Microsoft Store.
If Microsoft Defender SmartScreen displays a warning
Treat the warning as a reason to investigate. Check the publisher, digital signature, official download source, and reputation of the application. A warning can occur for a legitimate new application, but it can also protect you from malicious or uncommon software.
Do not turn off security globally
Avoid tutorials that solve one blocked installer by permanently disabling Microsoft Defender, SmartScreen, or other security controls. If the application is trustworthy and Windows provides an authorized one-time path to run it, that is preferable to weakening protection for every future download.
Windows 10 normal support ended October 14, 2025, which further increases the importance of being cautious with software installed on an older system.
Matt Jacobs has been working as an IT consultant for small businesses since receiving his Master’s degree in 2003. While he still does some consulting work, his primary focus now is on creating technology support content for SupportYourTech.com.
His work can be found on many websites and focuses on topics such as Microsoft Office, Apple devices, Android devices, Photoshop, and more.