CVan you buy tix at theater or so they have to be bought ahead of time?

Both

Best to secure your preferred seats online ahead of time to avoid any potential lines or let downs with seats that you may not want, especially if the movie you're going to see is popular one

I suggest you buy online so you can get seats..... And avoid disappointment

Yes can buy at theater or prepay and buy online whatever you prefer

You can buy a ticket ahead of time or at the theater. I think this theater is listed on Fandango.