My update keeps timing out. Why
Why does my security update 2019-001 10.14.6 keep timing out? The update loaded some of file before timing out. Any suggestions to correct this issue?
MacBook Air
Safe Boot from the HD, (holding Shift key down at startup), does the problem occur in Safe Mode?
Get it directly & try installing in Safe Mode...
https://support.apple.com/kb/DL2024?locale=en_US
Safe mode attempts to repair Disks & clears lots of caches, so if Safe Mode works try again in regular boot.