I can't install the liveries. I installed the Boeing 717 but keep getting error. Its says windows cannot access the specified device, path, or file. You may not have the appropriate permission to access the item. I tried opening as administrator and still get the same error. I tried restarting the pc and still the same error.

Please update your Windows Defender

OR

Try to do the following:
1. Open command prompt as administrator and change directory to c:\Program Files\Windows Defender
2. Run MpCmdRun.exe -removedefinitions -dynamicsignatures
3. Run MpCmdRun.exe -SignatureUpdate