This is a basic 'Timeout' error. This means communications or connection was taking too long so either FLEX or the server dropped the connection. This is error could be caused by many things.
'The download failed! Please contact support.
The operation timed out.
(12002)'
Correct the issue as follows:
Did you see a different error message?
Please see FLEX Connection or Download Errors and the solutions.
Image-Line Support Team