The Error message: C:\Users\<username>\AppData\Local\Temp\RarSFX3\setup.exe currently used by other program
The solution: disable "RapportMgmtService" for the purpose of installing SN7.
*** Or, it may be required to manually "End Task" for the RaportMngtService using TaskMngr.
Rapport Management Service seems to be a security software provided by some financial institutions.