Cannot Get all Companies from Public Data Api

Helllo Every one Hope so you are all fine.

I was Working with the Public Data api to fetch all Companies. First, I used the Advanced searche api to get records. I used the Company Status and Size Parameter to Fetch All companies of same status and 5000 records per page. It Worked Successfully but the problem is that i cant get the next 5000 records
When i try to give a start index of 5000 in the Parameter it works fine. but When i give start index more than 5000, it gives an internal server error

The API is NOT intended for bulk data download.
Are you aware of our free bulk product ?
We also have other bulk products if that one is not suitable.