Keeping Creative Cloud Products Separate from Stand-alone Purchases

Last year I purchased Lightroom 6 as a stand-alone product, which I installed on my primary home desktop.

Recently, I attended a course on using Lightroom and Photoshop, and followed a recommendation to purchase the Creative Cloud subscription versions of these applications, which I installed on my laptop.  I was advised during the course that I could also install these applications on my home desktop under the subscription rules.

I uninstalled the stand-alone version of Lightroom 6 from my primary desktop, and successfully installed the Creative Cloud subscription versions of both Lightroom CC and Photoshop CC.

My Adobe account clearly shows that I own the stand-alone Lightroom 6, as well as holding a Creative Cloud subscription for Lightroom CC and Photoshop CC.

I then tried to install my stand-alone version of lightroom 6 on my secondary home desktop, which my wife uses.  Even though I downloaded the installation files from the  "non-subscription" section of the Adobe website, it does not install as version 6, but as the CC version, and I get an error message telling me I have tried to exceed my allowed number of installations.

How do I keep my purchased version of Lightroom 6, which I fully own, separate from the Creative Cloud subscription installations?