This issue has occurred with two totally different IIS servers. The issue existed with a Windows 2003 server and the issue continues with a Windows 2016 server. The IIS configuration are standard/default settings. If the default settings for a web site in IIS is to blame for my problems, then I believe your company needs to alert their customers of this issue and provide a fix. Just saying, "The problem is on your end, sorry" when the IIS servers are using default settings is disappointing.

Perhaps you can see in your server logs what caused this.
There is nothing in the server log that provides any clues. All I see is that the very last .bin file is never reached. You see _00001.bin downloaded just fine in the LOG file. You see _00002.bin downloaded just fine in the LOG file. You see _00003.bin downloaded just fine in the LOG file. And then that's it. No error codes. Just simply the .bin files stop being accessed by the stub EXE.

So the LOG files tell me nothing, and what I get from you is simply, "The problem is on your end, sorry."