Windows 8 RTM running in VirtualBox on Windows 7 Pro.
After installing PreRequisites I got a window stating essentially "An app needs .NET 3.5 - Download or Skip". The program msi continued downloading so I clicked "Skip" and performed a custom installation of L5 (no resource download).
When finished it started OK with the Sign-in window, Preparing Library and then Synchronising. The main window opened and then crashed (14:26 in log).
0184.LogosError.zip
So I installed .NET 3.5 from Programs and Features - it took some time downloading additional files.
L5 still crashed (14:35).
Restarted the VM and L5 successfully opened (CTRL key held) to a Blank layout.
Used the scan command to get resources and indexing completed successfully.
Tried to open a Layout saved in L4 and L5 crashed again (below).
8424.LogosCrash-layout.zip
The crash details look to be the same as before i.e the crashes seem to be about loading L4 layouts, so I wonder if .NET 3.5 is needed?