I lost several hours on undocumented aspects of the beta installation.
It is possible to select C++ while deselecting TBB. This will cause the C++ (and possibly Fortran et al.) to fail.
There is no support for MIC KNC in the beta (even for linux), although KNL is supported.
On both Windows 8.1 and 10, Software Assistant failed at the end of installation, but this seems to be associated with missing documentation and doesn't affect usage otherwise.
the ReleaseNotes here https://software.intel.com/en-us/articles/intel-c-compiler-180-for-windows-release-notes-for-intel-p... contains a lot details. In short, the KNC support is removed in the 18.0 beta, and the new feature Parallel STL feature requires TBB.
About the software assistant, it seems a bug. If you still have the installation log, could you report this issue to the Online Service Center: https://supporttickets.intel.com/.
OK, I (and maybe the software assistant) was looking for release notes and docs to be included in the installation.
I guess you have too much volume of submitted installation logs. Maybe a way could be found to condense them so we can see what part is associated with failures? I'll look on another machine to see if I have any more.
I have a pset folder remaining from the last installation on Win10, but it won't upload when I create an issue on supporttickets. It doesn't appear to be a complete failure log folder.