App Store apps failing to install on High Sierra

There’s a new solution that appears to work by rebuilding a cache:

Hope this helps everyone:

  1. Open a terminal
  2. run the following command
sudo rm -f /Library/Keychains/crls/valid.sqlite3

I haven’t tested, but I think a reboot is not even necessary. And this does survive a reboot.

It looks like this file may be used by “trustd”. So worse case scenario, this will rebuid trustd’s cache, so that should not affect the security of your system.

https://discussions.apple.com/thread/252037712?answerId=253977725022#253977725022