This may be the issue reported on the sage-devel group, Sage 8.5 .dmg crashing macOS 10.14.2 at end of verifying .dmg. It turned out to be a problem related to using a virus scanner.
Your answer solved my problem. I disabled my virus protection software and I was able to install Sage 8.5!
Belated thanks!
Asked: 2019-01-04 20:17:34 +0100
Seen: 414 times
Last updated: Jan 04 '19
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