You can try changing the Gatekeeper preference via command line:
For families that share a Mac, you can leverage either Family Sharing or a purchase-based Apple ID to allow everyone to access the same apps (or a similar set) across the computer. How to allow single specific apps downloaded from «Anywhere» to be launched in macOS Sierra Simple bypass of opening restriction for unidentified Apps from within Finder The easiest way to open an App from an unidentified source is to simply Ctrl+Click (right click) the App in Finder, then choose Open – this will ask you to manually bypass.
sudo spctl --master-disable
That will allow installation from 'Anywhere.' Do a man spctl for additional options.
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As for disk space, try a:
df -h
You will get an output that looks like this (shortened)
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on
/dev/disk1 465Gi 273Gi 192Gi 59% 71601622 50244686 59% /
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In the list find your boot volume (mounted on will be / and likely /dev/disk1). What is the capacity %. If you have a runaway log you might have filled the drive.
Reid
Apple Consultants Network
Author 'Mavericks Server – Foundation Services' :: Exclusively available in Apple's iBooks Store
Author 'Mavericks Server – Control and Collaboration' :: Exclusively available in Apple's iBooks Store
Oct 1, 2014 4:11 AM