Do I need to download Mini Display Port to VGA update?

I want to be able to watch movies from the MBP on the TV.  (Panasonic 32" about 5 years old).  Air Play doesn't work through the ATV, the stream is erratic and unwatchable.  Both HDMI ports are in use for other things.  So I got a Mini Display Port to VGA adapter and a VGA cord and plugged it into the PC input on the TV.  I get the screen to come up (no sound, is that normal?) so it seems to work. 
Now I read that there is an update for the Mini Display Port to VGA.  I downloaded it then was unable to open it because it said it was from an "unidentified source" (Apple!!!!)  Do I need this?  The article that described this was dated 2009, so I'm thinking it is way obsolete but I want to be sure. 
And what about sound and VGA?  Do I need a separate audio in connection, and if so, to what input since the PC input is VGA only.
I know that's a lot of stuff.  Thanks. 
Mid-2012 MPB 13"  2.9 ghz  8 gb ram
10.8.5

Steve1000,
VGA only supplies video, so no sound is normal. You’ll need another connection to provide sound — perhaps through your audio out (headphones) port?
When you have the Mini DisplayPort to VGA adapter in use, run Software Update; if it doesn’t offer the adapter’s firmware update, then your adapter already has it installed.

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