All 15e Windows tasks are downloaded with an invalid character ':' in a file name. Windows dumps them as wrong.
Examples of computers:
https://escatter11.fullerton.edu/nfs/results.php?hostid=3876848
https://escatter11.fullerton.edu/nfs/results.php?hostid=1828644
https://escatter11.fullerton.edu/nfs/results.php?hostid=3990617

Log text for a task
https://escatter11.fullerton.edu/nfs/result.php?resultid=79847433

<core_client_version>7.6.33</core_client_version>
<![CDATA[
<message>
WU download error: couldn't get input files:
<file_xfer_error>
<file_name>842592:i8053.poly</file_name>
<error_code>-163 (file missing)</error_code>
</file_xfer_error>

</message>
]]>

I am having the same problem here.

+1 here as well.
Every 15e seems to be failing to download. Odd as 14&16 tasks download no probs.

I'm also having the issue - i have 8 download errors in the stats this AM.

I think that the bad work units are related to 842592:i8053 which is listed at https://escatter11.fullerton.edu/nfs/crunching_e.php. Could this bad name be restricted to either non-Windows hosts which handle the colon fine or be removed and reloaded under a different name so that it can be properly processed? I fear that one or more of the work units could get processed by 10 Windows hosts and therefore wind up being disposed of as an erroneous work unit by BOINC due to either too many total results or too many errors and therefore never successfully processed.