Updating from 5.7.5.13 to 8

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Hi, I've tried to follow the instructions for the upgrade, but it has failed 5 times now.

At the update page i get " Unable to retrieve information about this update from concrete5.org. You may upgrade but do so with caution." The notes and notices etc are greyed out also.

Running Supermint theme

And advice welcome, thanks

GuiseleySchool