Is there a way to transition from the Mixed SEO URL to the Advanced SEO URL package?

Thanks,

Andy

The safer would be to uninstall the mixed and then install the advanced. Since the same files are involved, you can do the two things at once for each files.

Then, since this will involve some change in your urls, you'll need to keep some of the old rewriterules up and running at the end of your new .htaccess. For example, if only your topic url will change, then you'll only need to keep the mixed topic rewriterules.

Post here both your old and new .htaccess if you have doubts.