I’ve had the same issue and have just started updating it manually through the command line, never could get it to work through the web interface.
Here is the page I used for updating it manually: How to update AMP to the latest version
I’ve had the same issue and have just started updating it manually through the command line, never could get it to work through the web interface.
Here is the page I used for updating it manually: How to update AMP to the latest version