I haven't seen that specific error but have you checked the following:
1. Ensure you configured the disk partitions in accordance with Unity install guide and compliant with your platform overlay.
2. Designate the install paths in accordance with your platform overlay
3. Check your disk space on the target install path
4. Check the media you are installing from to ensure it is "healthy"
It could be there is an error during the install that is "well known" and I am simply not aware of it. I am sure you will get some decent advice on this thread and/or the duplicate post. But, I would still check the items listed above.
You should still be able to install Unity. I have installed Unity on any old desktop running Windows 2000/2003 or VM image for testing. I think the problem is the path length size. Sometimes the scripts have issues copying from one place to another.
If you can, shorten the install directory name or the install file locations.
if your install directory is: Unity 7.0\disc 1\install files\version\.......
shorten it to d:\disc1
Where you install the files, do not edit the directory names. You should only change the letters from C: or D or E if you choose. Do not use a different name. such as D:\commserve to D:\unityinstall
If you downloaded the files from Cisco, you may have a bad image. Try and download again. WHen you unpack the disc, put it in say "Disc1" etc.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.