I bought the full Lightroom 6.0 this week (could not select "upgrade" in the Adobe Online store but own Lightroom 5.7).
After installing Lightroom 6.0 the system tells me that my Catalog has to be upgraded. After the upgrade procedure Lightroom 6.0 crashes on startup.
Windows 7 64 Bit Dutch with last updates and SP's. on a Dell 760 w 8GB RAM.
Cisca van Bommel
Journalist / Photographer
Try it with: Disable the GPU usage inside Lightroom