I recently switched from free to pro, I first deactivated my free in wordpress. When I installed pro, all landing pages I would create and the old ones I had on free won’t display. I can edit templates but when I want to preview the screen is just blank white. The new ones just show 404 in the landing page pane.
To fix 404 or A/B testing issues follow these steps:
From your WordPress Admin Dashboard, Head into Settings->Permalinks and re-save settings and re-check.
Manually view .htaccess file (in the root directory of your wordpress install, aka the folder with the wp-content and wp-admin folders located in it) and make sure #wordpress rules are on top and recheck (see below for example).
If solutions 1 & 2 fail then head into your wordpress base directory and delete the .htaccess file and then re-save permalinks.
If solution 3 fails then disable all other plugins and re-save permalinks and recheck the landing page URL.
If solution 4 fails please post the contents of your .htaccess file here for review.
Your htaccess file should look something like this:
# BEGIN WordPress
RewriteRule ^index\.php$ – [L]