macOS High Sierra stuck on Calculating... in App Store
I tried to download macOS High Sierra via App Store and clicked Download on its actual app page. The Download text just changed to Calculating... and it has been like that for a very long time (and nothing appeared on my Purchased List of my account).
I'm using MacBook Pro (13-inch Mid 2012) running on 10.12.6. The macOS High Sierra didn't appear on the available updates page. I tried to update Keynote/Pages/Numbers, it was downloading apps but it wasn't updated to the latest one (Keynote 7.3), it was just 6.0.1.
Is there a way to possibly reset the Mac App Store? I've tried signing out too. The account works fine on other Macs (Mac Mini and MacBook Pro Retina) so I was wondering why it's not working on the old one.
Thanks in advance.
MacBook Pro, macOS Sierra (10.12.6)