[1.29.28.0] Clean install on a new PC : You are missing packages that are essential to run Microsoft Flight Simulator. Please update the application and try again

User Support Hub Hardware & Peripherals
166

That link is broken, comes up with 404 error (page not found). Is there an updated link please?

167

You are right. I found below links, follow the one base on your system:
Fix problems with apps from Microsoft Store – Microsoft Flight Simulator Support (zendesk.com)
How to repair Microsoft Flight Simulator on Steam – Microsoft Flight Simulator Support (zendesk.com)
How to repair or uninstall Microsoft Flight Simulator via the Xbox app – Microsoft Flight Simulator Support (zendesk.com)