As expected, I have no problems uploading your file, with FTP nor with SFTP.
A new signature/certificate can indeed be a reason an antivirus might find your file suspicious (worth deeper/longer testing).
I've also noticed that you are using a proxy. The proxy might be also doing some tests.

You might be right, Martin. I spoke to the GoDaddy hosting support but they said nothing on their end should be affecting uploads, but I question their knowledge. I will call the site security people tomorrow. I know they do site AV/malware scans.

Turns out the successful upload was not because AntiVirus was removed. Today I uploaded from another computer, same error, but rather than aborting right away I let it continue. Then I aborted and the file was fully uploaded. Repeated this twice.

Now I am wondering if the new code signing process could be affecting the upload. This process uses a secure USB Token from Thales Safenet to hold the certificate information. Installshield uses a custom process to sign Setup ccScan and the msi package. It uses the Microsoft signtool.exe and asks for the USB Token password several times during the build. The secure token was mandated by the This is the only New thing in the whole build and upload process.

Here is the file if you want to try uploading it to a site with WinSCP.
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@cefegCC: Imo, it's rather their antivirus (on the server) that might be causing this.

Hi,
I uninstalled OneDrive, Dropbox and Bitdefender. Rebooted. Tried an upload of the file from last December. Internet was very slow at this time 5-6 PM PST (cable) but after 1:45h,the file was 99% complete with no issues. Then the upload stopped, ststus said connecting, and file was complete without error. now to find thr culprit.
Thanks for your help. Looks like WinSCP was not the problem, although I will retest in the morning.

Good idea. I just tried that with a similar file from last December, when it uploaded with WinSCP without error. Now the same error exists with the older file. I downloaded FileZilla to try at GoDaddys suggestion, and it reported the the same error with the new and old file. Godaddy FTP support confirmed that permissions for folders were OK and no process could be affecting the uploaded files.

Now I am wondering if my anti-virus/firewall BitDefender is causing this. I turned the firewall off but still have the problem.