By default, 10.5.1 caps tree quality. To unlock legacy ultra trees:
Click . The core engine (the .exe files) will install in about 3-5 minutes. Do not tab out during this phase. How To Install Lumion Pro 10.5.1
Update your GPU drivers. Then go to C:\ProgramData\Lumion 10\ and delete the Settings.ini file. Restart Lumion. By default, 10