Serial number lockout after signing out of other computers

OK, this is a bit complicated, but the short version is this: I had extra computers which I had apparently installed Lightroom 6 on, which was purchased as a single purchase, NOT Creative Cloud Rental method. I think it was left on an old Mac Pro and an old MacBook Pro in addition to having it on a newer Macbook Pro and a newer Mac Pro. I launched it, signed off on the old laptop, and had to install it, activate it on the old Mac Pro and then sign out. As far as I can tell, these were the only others, so it should just be running on my new Mac Pro and my MacBook Pro. However, it still tells me that there are too many serial numbers in use, and unfortunately I was not attentive to this fast enough and now it has locked me out of Lightroom on my Macbook Pro and I can't even get into Lightroom to sign out of it.

I doubt deleting the programs and reinstalling is going to help, but maybe someone at Adobe can wipe my install record clean. I don't use creative cloud at all, and I do not want or need any cloud access from adobe for what I do. I just need the programs to work on 2 of my computers...

Any suggestions?

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The longer story.

Yeah, I'm a computer hoarder. I have an old Mac Pro which I had mothballed for a while and decided to move it upstairs, so I updated the system software and got it up to snuff, but I don't remember whether I reinstalled it on this computer. I have a new Mac Pro Cylinder in the basement, and that had lightroom on it, which I believe I upgraded to Lightroom 6. I also had Lightroom 6 on my work MacBook Pro which was a 2008 model. My daughter thought her MacBook pro 2011 was broken, so she bought a new one. I took her old one (since it was faster than what I was using), put a new hard drive into it to rejuvenate it, and kept it as my new main laptop after I swapped the hard drives between my old 2008 (which had a faster, newer hard drive than the 2011) and the 2011. I definitely did not deactivate Lightroom when I did the hard drive swap (who can remember  — sorry, I'm also over 50).  Like I said above, I installed and deactivated Lightroom on the old Mac Pro and my old MacBook Pro, but it is still saying "too many serial numbers" and I am locked out of lightroom completely on my MacBook Pro. It is currently active on two computers: MacBook Pro 2011, and Mac Pro 2013. I believe the license lets you have it on a desktop and a laptop, no?