Old queries doesn’t work after update

I have been using the plugin since January, and today I've purchased the new license for the plugin. For this time, I've collected the list of queries that was giving good results. But after the update and entering the new API key, queries I've previously used don't work. In the "Plugin Registration Info" box (Main settings board), there is old license info, and all results are giving me the red cross or yellow rhombus status with no post articles at all. What can be the problem? And how to fix that? Thanks in advance!