Flash DMG suddenly appeared

Just a moment ago Flash Player DMG appeared on my desktop.  Also CarbonCore appeared.  A similar question indicated Flash was on  V 18.....  This one is 17 MG (wow), dated 12/23.    I'm attaching a screen shot and after pressing space ar.

The post continued to suggest running a terminal command.  I wasn't sure whether to add a space or not.  Here's both results:. 

Last login: Tue Dec 29 08:10:21 on console

My-computer:~ username$

My-computer:~ username$ codesign -vvd

Usage: codesign -s identity [-fv*] [-o flags] [-r reqs] [-i ident] path ... # sign

       codesign -v [-v*] [-R testreq] path|[+]pid ... # verify

       codesign -d [options] path ... # display contents

       codesign -h pid ... # display hosting paths

My-computer:~ username$ codesign -vvd/Volumes/Flash\ Player

codesign: invalid option -- /

Usage: codesign -s identity [-fv*] [-o flags] [-r reqs] [-i ident] path ... # sign

       codesign -v [-v*] [-R testreq] path|[+]pid ... # verify

       codesign -d [options] path ... # display contents

       codesign -h pid ... # display hosting paths

My-computer:~ username$ codesign -vvd /Volumes/Flash\ Player

/Volumes/Flash Player: bundle format unrecognized, invalid, or unsuitable

My-computer:~ username$

("My-computer" and "username" replaced the real information.

Because it seems old, I put it in trash.

I saw further information, but I didn't even understand the questions or comments.

I've got El Capitan, A Macbook Pro 13" late 2011, and a Honda Civic (it sometimes feels I need to provide my blood type.)