The new installer (from v.2.0.0) automatically installs all necessary plug-ins and you not need to install manually. You have problems with the installed files with installer?
I tested on all OS (7, 8, 8.1, 10) and about 20 machines - weren't watched problems with files locking. With downloaded - yes, it is possible.
And why for the users such complex dances with Powershell when it is possible to manage much more simply with right click > Properties (if blocked - you can find option Unblock)...