We have installed the latest of the mosaico extension (2.4.1592820024).
Either entering the Mailings >> Mosaico templates area or Administer >> System status results in an error message
Unrecognized Angular module
Or via civiCRM log files
[name] => crmMailing [civi.tag] => deprecated Unrecognized Angular module
The readme for beta-3 mentions both a validation step and the various template versions and an upgrade to verify them?
I've looked in /civicrm/admin/mosaico?reset=1 and don't see a verification or upgrade system? How do I install this extension and check that it is valid?