Activating an L3 product on a Mac L4 license??

OK, so here's the deal:

I buy an L3 resource, lets say the Word Biblical Commentary on CD-ROM. I am on a Mac and I am L4. How do I go about getting this into my library?

This is still relevant if you're on Windows and you are running L4 and you don't want to install L3.

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You call support, and you give them the serial number, and they add it to your licenses. Then it will be downloaded the next time you start Logos.

Well that is exactly what I thought. I just wanted to make certain before I threw down the hard un-earned cash.