Urgent Help! Changing category name and permalinks

Hey,

I am need of some urgent help! Last night I went ahead and changed the permalink structure on my site to just read the %postname% instead of the %category%/%postname%. Then I download the Permalinks Migration plugin.

After that I renamed the “Sponsored Post” category to “Paid Plug” and changed the permalink to “paid-plug”. Now any of the old posts with the “sponsored-posts/post-name” structure will not forward to “post-name”. I’m figuring it’s because I renamed the “Sponsored Post” category to “Paid Plug” and changed the permalink structure to “paid-plug”, so how would I go about fixing that?

Thanks!