Tror ikke mac har windows update.

Prøv dette fra apple sine sider:

1.From the Apple menu  in the corner of your screen, choose System Preferences.

2.Click Software Update.

3. Click Update Now or Upgrade Now:


Funker ikke denne så gå igjennom:

https://www.wikihow.com/Fix-SSL-Cert...s-on-PC-or-Mac

Step 5 er nok mest aktuelt for ditt tilfelle:

"On a Mac, press Command + Spacebar' to open Spotlight search, type keychain, and then click Keychain Access to open the app. Click login in the left panel, then click Certificates under "Category" in the left. Delete the certificate that's giving you trouble by right-clicking it and selecting Delete.[4]"