If the browser is missing from your Windows 10 system, you may be able to toggle it back on:
The browser is already built into the OS, but it is disabled by default or redirected to Microsoft Edge. You typically do not need to download it; you only need to enable it or use its features through other means. internet explorer 11 download
Restart Edge. You can now right-click a tab and select "Reload tab in Internet Explorer mode". If the browser is missing from your Windows