POSITIVELY signed out of PSE18 on old computer before trying to install on new computer

Before I set up my new computer, I POSITIVELY signed out of PSE18, then uninstalled it. Then, with the new computer now ready, last night I tried to install PSE18 on it. I had saved the Setup file onto a DVD when I purchased it in February of 2018. So now I click on the setup file, which extracts, then stops and asks me to sign in. Each time I am told I'm being "temporarily" blocked due to a "security issue" and asked to try again later. I just tried it again tonight and got the same. I do have the program installed on one other computer, which I've always had so I can view the original of the picture I'm working on on one computer while restoring it on the other. In any case, just now I opened PSE on the other computer and signed out of it, just in case that was the problem. Again I tried to install on my new computer and got the same thing. Please tell me how I can install PSE on the new computer--so I can continue restoring my family's photos, just as I have for over 20 years (and I've lost track of how many versions I've upgraded to before 2018).