Hi there!
Thank you much for kind words about our product, we really appreciate it.
This problem is, unfortunately, beyond our control, so we can only offer a workaround, and not a fix for now. Microsoft deployment project boostrapper, the Setup.exe, sometimes won't download dependency MSI from the web with that error. Once it does it, the only thing one can do is to
download and install UWS from our web site.
You can avoid this problem by including UWS MSI file prerequisite into your installation package, w/o having it downloaded from our web site. That will make this problem go away, but it will also not downloading latest & greatest version of UWS as we keep posting upgrades.
Another way is to use installation authoring tools like Advanced Installer, InstallShield, etc. Those have their own bootstrappers that don't have this problem.
Best regards,
UltiDev Team.
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http://www.ultidev.com/products/Donate.aspx to help us improve our products.