Hi Alica,
Thanks for reaching out to us. Please make sure you have installed the following-
Additional Variation Images Gallery for WooCommerce Free 1.3.1
Additional Variation Images Gallery for WooCommerce Pro 1.3.1
If your Pro version is older than 1.3.1 please download the latest version from here.
And please follow our documentation.
Please let me know if you have further issues.
Thank You
Update
Alica Jacobi
Hello, I always had the plug-in with key but it expired. I bought a new license and just wanted to update the key in my WordPress. but that doesn’t work. What do I have to do to use the product I just bought? Alica