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Let me know how it turns out. If the problem persist, I'm glad to help good luck!

Hi there! Yes, pages with poor user experience do affect SEO, even more if those pages receive traffic from google. So there are two scenaries here, regarding whether they receive traffic: 1. They do receive traffic, either move to other CMS (like wordpress and woocommerce) or improve those pages experience. 2. Do not receive traffic, leave them as is. Alls this is considering that you are not able to change Robots.txt and do not want to move to other CMS. Adding nofollow links will not make any difference, because Google does honor the robot.txt, so pages blocked there will not be crawled never. So as to remove them fron index is crucial beind allowed in robots(or what's the sabe, not being disallowed) Hope it helps. Best Luck. GR