"DBISAM isn't exactly a mainstream dev, but I found their website still has downloads for version 4. If that's what you're looking for, you can try grabbing it from there. Good luck!"
"Hey OP, I think I can help you out. DBISAM isn't exactly a widely used database anymore, but it's still around. Have you tried checking the InterBase forums or the DBISAM wiki for any leads on a client-server solution?"