This has been discussed here before. The problem is a bug in app transport
security in 10.11. So you need to download the last update manually, if you
cannot upgrade your system. The last update contains a workaround for the
system bug, so you won't have to do this in the future.
Christiaan
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Hi,
I had been running Skim 1.4.29 on both 10.6.8 and 10.11.6. I just now tried to
update to the latest (using “Skim -> Check for updates …”).
The update succeeded on 10.6.8, but failed on 10.11.6. The failure alert said
“Update error!
An error occurred in retrieving update information. Plea
