download fails after downloading only few files in SSIS

there are 900 folders and the ssis package fails after downloading 61 files with the following error

[Execute Process Task] Error: In Executing "C:\Program Files (x86)\WinSCP\WinSCP.exe The process exit code was "1" while the expected was "0".

what might be the reason for that?

now it failed after downloading 120 folders and then it failed with the same error?
its quite random

Sorry, your post does not include enough information.

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