This application requires the Windows App Runtime

Okay. I got it to work. Here's what I did:

1. Go into the file folder and install the Windows App Runtime files from the Meta Spatial Editor folder:

"C:\Program Files\Meta Spatial Editor\v1\WindowsAppRuntime". I had to install "C:\Program Files\Meta Spatial Editor\v1\WindowsAppRuntime\Microsoft.WindowsAppRuntime.1.5.msix" and "C:\Program Files\Meta Spatial Editor\v1\WindowsAppRuntime\Microsoft.WindowsAppRuntime.Singleton.1.5.msix"

I then received a vrcore.dll error so I deleted the registry.

Goto Registry editor-> win+R->regedit->HKEY_LOCAL_MACHINE->SOFTWARE->Microsoft->Windows NT->CurrentVersion-> Image File Execution Options -> MetaSpatialEditor.exe ->Right Click and export the registry settings for backup. ->Right Click and select Delete for the MetaSpatialEditor.exe registry entry for your application. Then run. (It worked for me).

Your mileage may vary. Be careful because this involves registry edits. Good luck!