I just upgraded to Smush Pro and now the 'free' Custom

I just upgraded to Smush Pro and now the 'free' Custom Sidebar I use won't update. Its prompting me to upgrade to get latest version. I understand there may be code and version differences between 'free' and 'paid 'pro' version, but I do NOT need to be forced into upgrading a plugin for which I do not need additional functionality. Once I disable dashboard the plugin notification goes away. So tit appears that as new updates are released for both versions, my 'free' Custom Sidebars won't get updated because dashboard is looking for Pro version. Can you explain?