5.7 Update

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My site is on version 5.7.4.2 and shows there is an update to 5.7.5.13
However, when I go to do the update I get this error message.
"Unable to retrieve information about this update from concrete5.org. You may upgrade but do so with caution."

I did the update once before and it bombed my site so I'm not going to click it again without knowing why this message appears and if this is the right thing to do.

Anyhow know please?
Thanks in advance.

deanhawthornthwaite