Sounds like an issue with the content you're attempting to view, in which case you'll need to contact Rockwell for assistance.
Microsoft embeds Flash Player in IE & Edge on Windows 10. All updates are released by Microsoft via Windows Update and there is no separate Flash Player ActiveX Control installer for Windows 10.
IE and Edge both block Flash Player by default. The browser relies on the content's Flash detection scripts to detect the content content requires Flash in order to prompt the user to Allow Flash. If you're being prompted to install Flash, instead of Allow Flash, the content's Flash detection scripts do not conform to the browser requirements and the browser can't prompt you to Allow Flash. Nothing we can do in this case, as it's a content issue that Rockwell needs to fix.