My iMac will not recognize a plug-in for my Magellan GPS

I have worked with Magellan tech support with this problem and everything we tried didn't work. My OS is 10.11.6.

I would appreciate any ideas that might solve this problem.

iMac, Mac OS X (10.6.8)
Has invited:

howapple - hello

Favor from:

Is this an Internet plug-in ? . Is it meant to work in a web browser ?.

If so, does it show in Safari - Help - Installed Plug-ins or Safari - Preferences - Websites ?.

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