While doing routine WordPress updates I came across this error:
cURL error 18: transfer closed with X bytes remaining to read
After some investigation I found that my hosting server was unable to download files. Much of the advice I found suggests issues with cURL, PHP, or WordPress. If possible I advise checking the host server first. Verify that it can download the update file.
An information technology professional with twenty year's experience in systems administration, computer programming, requirements gathering, customer service, and technical support.