I would like stop users from upgrading to 10.15.4 due to these warning messages coming up for legacy system extensions. Currently users are admins on there laptops and we don't have a separate Software Update Server. What's the best way for to do this and give them access back again once software providers have updated their software.
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The best to achieve this would be to use the ignore flag with the softwareupdate command
from the man page:
--ignore identifier ... Manages the per-machine list of ignored updates. The identifier is the first part of the item name (before the dash and version number) that is shown by --list. See EXAMPLES.
sudo softwareupdate --ignore JavaForOSX
Ignored updates: (JavaForOSX)