Some files are not being downloaded in a Checkout to a shared path.
same error for those files:
E03020028: The File Agent error for item <computer>\\<drive>\<folder>\<file>: Can't open signature file.
Release : 13.0.3
Component : CA HARVEST SCM CORE FUNCTIONALITY/PROCESS AUTOMATION
Sometimes intermittent network interruptions can cause Harvest to temporarily not be able to read/write to the mapped network drive.
Proposed workaround is to install the SCM agent on the target machine and check out using the agent instead of a mapped network drive.