Hi, Coach -
Welcome to Apple's Discussions.
This problem usually occurs with a machine using a dial-up connection. There is a setting in the Modem control panel to set a wait interval of inactivity, after which the connection is automatically terminated. For some reason the process of downloading a file is not treated as "activity"for this purpose.
Solutions include -
• Setting the inactivity period in the Modem control panel to a greater length of time.
• Set your email program to check for mail at intervals a bit shorter than the inactivity wait period set in the Modem control panel. The act of checking mail will be perceived as activity, resetting the timer.
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Many browsers also permit the resumption of an interrupted download.
For example: in Internet Explorer, open the Download Manager (in Tools menu). Double-click the interrupted item in the list. A new window will open, showing some info about that item. Click the "Reload" button - the activity bar will go rapidly to the point downloading was interrupted, then it will resume the download at that point.