External CD device not being acknowledge by Apple laptop

Hi there,
I have just purchased PSE12 on DVD for my Apple Laptop. This laptop does not have an internal CD/DVD reader/writer so I purchased a LG Super Multi several years ago and have successfully installed several CD programs. However, now the laptop doesn't even acknowledge the presence of this device. My PC (not apple) confirms the unit is working correctly. Not sure what to do now.
Macbook Pro OS X version 10.8.5, 2.6 GHz core i7, 16GB memory.
I will appreciate any advice.
Kind regards,
Sally

Thank you Barbara, I was going to do this if I couldn't find another
solution. Although I didn't really want to do this because the file size is
2.59GB and I have terrible internet service (no city benefits of ADSL
here).
There must be a reason why the external device is no longer being
recognised by the laptop. I guess I need to investigate further. Any
other suggestions?
Regards,
Sally

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