client change name

I bought a powerpoint theme for a client. I edited the theme and submitted the work.
This customer has now been acquired by a larger company and has changed its name, my question is have I lost my license?
Now that he asks me about changes to the delivered powerpoint, can I use the license I had?

Yes, you can. The name change does not affect the license in any way.

But i can use my license for modify the previus ppt and they pay me for this? Or i have to buy another license?

You can use your license