Marcelo, all HANA DBs are 64 Bit and that has no effect on the client driver version you need to use.
As explained above, you want to use a 32-Bit program (Excel) to talk to HANA.
The client software is it what enables your program to talk to HANA.
So, simply install the right bit-version for your client program.
The 64-Bit version of SAP HANA doesn't change anything about this.
All this is only about the software on your client computer - not about the server.
- Lars