How do I restore a missing IIS Express SSL Certificate?

Windows 10 users: Repair is only in the Control Panel, not in the Add Remove programs app. I typically run appwiz.cpl to launch the old control panel applet and run repair from there.

Windows 7 and 8.1:
After going to Add/Remove Programs and choosing the “Repair” option on IIS Express, the certificate has been reinstalled and I can now launch IIS Express sites using HTTPS.

Repair IIS Express

The certificate is back:

IIS Express Development Certificate

And I can now launch the IIS Express site using HTTPS:

Success!

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