The WPSecure wallpaper will only run on Windows 7 Service Pack 2, Windows 10, and Windows 11 devices.
Microsoft DotNet Framework 4.5 (or higher) has to be installed. Windows 10 and Windows 11 have newer versions of DotNet Framework but those versions are downward compatible with version 4.5. Windows 7 devices need to have DotNet Framework 4.5 installed before installing the WPSecure packages.
Optional but recommended: Add exclusions for the WPSecure wallpaper package location for your AntiVirus software. Documented here ==> https://osd365.com/wpsecure-documentation/?section=antivirus-exceptions