If you’re still using the free version, upgrading to the package (including the wordpress-seo-premium_19.5.zip file) unlocks essential growth tools:
Fixed a rare but critical bug where using version 19.5 alongside older Premium versions could cause front-end errors. wordpress-seo-premium_19.5.zip
Automatically prevent 404 errors when you move or delete content. If you’re still using the free version, upgrading