Mike usually, like my security plugin which didn't activate mine either, you can generally add a URL to a whitelist and
Ha.... I got the activation to work. I had to turn off 'Enforce SSL' in my security plugin. Don't want to, but for now I guess I'll have to.
it ignores that URL (I think it was the license.php file url I had to add it, then it activated.
The only other thing to look at is the .htaccess file in the root of public_html. Delete it and go into WordPress permalinks and 'save' and it will recreate it. Maybe there was a leftover rule was another plugin that didn't remove itself.
Just got home... you're asleep like a baby, I think lol.