Occasionally product pages and categories will give a 404 error after installing the Perfect SEO Url plugin. This is because all your urls will change to a new situation.
You can force the change yourself. There are a few steps you have to take:
- Empty the cache of your WooCommerce website/webshop
- Resave the permalinks
- Don’t refresh your page, but wait until the proces is finished
WordPress will reset all urls at that moment. Most likely your pages and categories will work now. Please not that this can take up to 10 or 15 seconds, depending on the number of products and categories your shop has.