On April 1, 2017, Google will discontinue sales of the Google Site Search. All new purchases and renewals must take place before this date. The product will be completely shut down by April 1, 2018.
There is still time to renew your paid version or you can use the Free version of site search.
Google announced yesterday:
We are winding down the Google Site Search product over the next year, but will provide customer and technical support through the duration of license agreements. For GSS users whose contract expires between April 1st and June 30th, 2017, we are providing a free 3-month extension with additional query volume to allow more time for them to implement the necessary changes to their site. GSS customers may also take advantage of our Custom Search Engine solution, an ads-supported model that offers similar functionality. We continue to build out new functionality and invest in new technology that make enterprise search a great experience for our customers. Just recently, we introduced the general availability of Google Cloud Search for G Suite customers.
Article By: Seoroundtable