Plugin stopped working after updates

Hi,
My search plugin – purchased – seems to have stopped working entirely. It may be because I updated the plugin, after every update.

It was installed a coupler of years back.
It was working at that time but never used by client.
I kept on updating the plugin, everytime when there was an update but do not know when it stopped to work 🙁
Now my client wants to make it line and I found that it is not working.
I created a new index but still there is nothing shows in the search page.

Can you please help me debug and fix this?
Thank you
Asma